Chinese Hillstream Loach (Pseudogastromyzon myersi)

The Chinese Hillstream Loach (Pseudogastromyzon myersi) is native to freshwater streams in southern China, where it inhabits shallow, rocky environments with clear, flowing, oxygen-rich water. These streams feature smooth stones, gravel, and exposed rock surfaces that support natural communities of algae, bacteria, and other microorganisms collectively known as biofilm.

Water moving around larger rocks creates a variety of microhabitats, from exposed surfaces with stronger currents to sheltered pockets with gentler flow. Chinese Hillstream Loaches use their flattened bodies and broad, specialized fins to maintain contact with submerged surfaces while grazing and moving between feeding areas. This combination of flowing water, natural rock formations, and established biological growth shapes much of their behavior in the wild.

A Chinese Hillstream Loach (Pseudogastromyzon myersi) aquarium should resemble a shallow, rocky stream, with naturally weathered stones, open grazing surfaces, and water moving around larger rock formations. The best layouts combine exposed feeding areas with sheltered spaces where these bottom-dwelling fish can rest away from stronger currents.

Hardscape & Natural Structure

• Natural River Stones: Use rounded, lightly textured stones with broad exposed surfaces where algae and biofilm can develop. These are the most important elements of the aquascape.
• Larger Rock Formations: Arrange stable groups of rocks to create sheltered pockets, visual barriers, and separate grazing areas for multiple loaches.
• River Gravel: Fill spaces between larger stones to create a natural streambed while keeping accessible surfaces open for feeding.
• Spider Wood (Optional): A small piece can add visual interest and additional grazing surfaces without overwhelming the rocky layout or obstructing circulation.

Aquatic Plants

Plants are optional but can provide natural contrast and additional surfaces for biological growth. Choose varieties that can be attached directly to hardscape.

• Anubias (Anubias barteri): Its sturdy leaves provide additional surfaces for biofilm and fit naturally into sheltered areas.
• Java Fern (Microsorum pteropus): Attaches to rocks or driftwood and adds greenery without requiring planted substrate.
• Bucephalandra (Bucephalandra spp.): Compact growth makes it suitable for crevices and sheltered spaces between stones.

Keep most of the larger rocks uncovered so the loaches have plenty of accessible grazing surfaces.

Botanicals & Natural Details

Botanicals are not necessary for Chinese Hillstream Loaches. Their natural habitat is better represented by exposed rocks and flowing water than by a heavily leaf-littered, tannin-rich aquarium.

Small amounts of leaf litter can be used decoratively in sheltered areas, but avoid allowing decomposing material to accumulate between rocks.

Substrate, Lighting & Layout

Substrate: Use sand, river gravel, or a combination of both beneath larger stones. Prioritize stable rock placement and a substrate that is easy to keep clean.

Lighting: Moderate to bright aquarium lighting can encourage natural algae and biofilm development on exposed surfaces. These grazing opportunities supplement, rather than replace, a varied diet.

Water Movement: Direct circulation across the rockwork while maintaining surface agitation for oxygen exchange. Include calmer pockets behind larger stones and protect circulation-pump intakes.

Layout: Position broad grazing stones in several areas rather than concentrating them in one location. Leave an accessible, lower-flow feeding area where sinking foods can be offered without immediately washing away.

How Chinese Hillstream Loaches Use the Aquascape

Chinese Hillstream Loaches spend much of their time moving across rocks, grazing on biological growth, and exploring sheltered spaces. Although generally peaceful, individuals may defend preferred feeding surfaces through brief chasing and territorial displays.

Providing multiple exposed stones and separate feeding areas allows several loaches to forage without constantly competing for the same space.

Aquatic Arts Tip

Build the rockwork first and allow the aquarium to mature before introducing Chinese Hillstream Loaches. A combination of established grazing surfaces, sheltered resting areas, and an accessible location for supplemental feeding will support their natural behavior far better than decorative rockwork alone.

The Chinese Hillstream Loach (Pseudogastromyzon myersi) is an omnivorous grazer that feeds on algae, biofilm, and the small organisms living among these natural growths. Although frequently described as an algae eater, this species requires a varied diet that includes animal protein. Established grazing surfaces are important, but they should never be the fish's only source of nutrition.

• Natural Algae & Biofilm: Mature rocks and submerged surfaces support communities of algae, bacteria, and tiny invertebrates that provide natural grazing opportunities throughout the day.
• Balanced Sinking Foods: Offer high-quality sinking pellets, bottom-feeder tablets, or algae wafers containing both plant-based ingredients and appropriate animal protein. Algae-only foods should not form the entire diet.
• Small Live & Frozen Foods: Supplement with appropriately sized Daphnia, Moina, brine shrimp, and finely portioned frozen foods. Bloodworms can be offered occasionally rather than as a primary food.
• Gel Foods & Vegetables: Suitable protein-containing gel foods can be applied to stones or offered in small portions to encourage natural grazing. Softened zucchini is optional and may not be accepted by every fish.
• Feeding Frequency: Offer small amounts daily, adjusting portions and frequency according to body condition, natural food availability, and feeding response. Newly acquired loaches may take time to recognize prepared foods and should be monitored closely.
• Feeding Locations & Food Waste: Place food on broad stones or in sheltered, lower-flow areas. Use multiple feeding spots when keeping several loaches so less dominant individuals can eat. Remove uneaten prepared foods and vegetables before they deteriorate.

Aquatic Arts Tip: A rock covered in algae does not necessarily provide a complete meal. Watch each Chinese Hillstream Loach during feeding and look for a well-maintained body condition, active grazing, and regular acceptance of supplemental foods. Aquatic Arts live Daphnia or Moina may provide additional variety when appropriately sized and accepted, but should complement rather than replace accessible sinking foods.

The Chinese Hillstream Loach (Pseudogastromyzon myersi) is generally peaceful but may defend preferred grazing surfaces from other bottom-dwelling fish. The best tank mates tolerate cooler, well-oxygenated water, are nonaggressive, and do not compete heavily for food or territory. Compatibility depends on more than temperament; temperature, water movement, and feeding behavior must also overlap.

Recommended Tank Mates

• White Cloud Mountain Minnow (Tanichthys albonubes): Including Gold White Cloud varieties, these peaceful schooling fish tolerate similar temperatures and primarily occupy the middle and upper water levels. Provide open swimming space and areas with gentler current.
• Zebra Danio (Danio rerio): Including Leopard Danio varieties, these active schooling fish appreciate well-oxygenated water and tolerate cooler temperatures. Their enthusiastic feeding behavior makes separate sinking-food locations important.
• Chinese Hillstream Loach (Pseudogastromyzon myersi): Additional individuals can display fascinating natural interactions when provided with adequate aquarium space, multiple exposed grazing stones, and separate feeding areas.

Tank Mates to Consider Carefully

• Rosy Barb (Pethia conchonius): Tolerates cooler temperatures and generally occupies the middle water levels. Its larger adult size and active feeding behavior make it better suited to spacious aquariums with dedicated feeding areas for the loaches.
• Reticulated Hillstream Loach (Sewellia lineolata): Shares an appreciation for oxygen-rich, flowing water but may compete for grazing surfaces and territories. Best considered in larger aquariums with extensive rockwork and multiple feeding locations.
• Celestial Pearl Danio (Danio margaritatus): Prefers planted, sheltered areas with gentler water movement. May coexist in a carefully designed aquarium offering distinct habitats, but is not a first-choice companion for a strongly flowing stream setup.
• Peppered Cory Catfish (Hoplisoma paleatum, formerly Corydoras paleatus): Tolerates cooler temperatures but prefers accessible substrate for foraging and areas without excessive current. Provide sufficient bottom space and separate feeding opportunities.
• Bristlenose Pleco (Ancistrus spp.): Some individuals may tolerate overlapping temperatures, but their feeding habits and territorial behavior can create competition. Verify the particular species' temperature requirements before considering this combination.

Tank Mates to Avoid

• Large or Aggressive Cichlids: May intimidate, injure, or prevent Chinese Hillstream Loaches from accessing food.
• Warm-Water Specialists: Fish requiring consistently high tropical temperatures are unsuitable for a cooler stream-style aquarium.
• Aggressive Bottom Dwellers: Territorial species that dominate rocks, shelters, or feeding locations may prevent the loaches from establishing their own grazing areas.
• Large Predatory Fish: Any species capable of swallowing or injuring these small, bottom-dwelling loaches should be avoided.

Aquatic Arts Tip: Build the community around compatible water conditions first, then consider where each fish spends its time and how it feeds. Peaceful midwater schooling fish are often better companions than additional bottom dwellers competing for the same rocks and sinking foods.

Shrimp Safe: Generally Yes, with Adult Shrimp — Shrimplets at Risk

The Chinese Hillstream Loach (Pseudogastromyzon myersi) is generally compatible with adult freshwater shrimp when their water requirements overlap. Its natural feeding behavior centers on grazing algae, biofilm, and small organisms from submerged surfaces rather than actively hunting shrimp.

Recommended Shrimp Companions

• Neocaridina Shrimp (Neocaridina davidi): Adult Cherry, Blue Dream, Yellow, Orange, and other Neocaridina varieties are generally suitable companions in established aquariums maintained within their overlapping temperature requirements.
• Amano Shrimp (Caridina multidentata): Their larger adult size and independent foraging behavior make them another good choice for a peaceful, well-established aquarium.

What About Baby Shrimp?

Newly hatched shrimplets are small enough to be consumed opportunistically while the loaches graze. Although Chinese Hillstream Loaches are not known as specialized shrimp hunters, shrimplet survival cannot be guaranteed.

Both shrimp and hillstream loaches graze on biofilm, so provide ample established surfaces and supplemental foods to prevent competition for limited natural food.

Aquatic Arts Recommendation: Chinese Hillstream Loaches are reasonable companions for established adult Neocaridina and Amano Shrimp when water conditions are compatible. We do not recommend them for dedicated shrimp breeding aquariums where maximizing shrimplet survival is the priority.

Breeding Difficulty: Advanced — Captive Breeding Reported, but Uncommon
Reproduction Type: Egg-Laying; Substrate Nesting Reported

Breeding the Chinese Hillstream Loach (Pseudogastromyzon myersi) has been reported in home aquariums, although successful reproduction is not considered routine. Some historical breeding accounts involve closely related Pseudogastromyzon species, particularly P. cheni, making accurate species identification important when evaluating these reports.

Breeding Behavior

Published aquarium accounts describe males preparing nesting sites beneath gravel or small stones, where eggs are deposited and covered with substrate. However, these observations should not be treated as a guaranteed breeding pattern for every fish sold as P. myersi.

Breeding Requirements

A mature aquarium with clean, oxygen-rich water, suitable substrate, established biological growth, and consistent nutrition supports the health of breeding-age fish. However, there is no universally established aquarium breeding method that reliably produces offspring.

Aquatic Arts Recommendation

Chinese Hillstream Loaches are best purchased for their distinctive appearance and natural grazing behavior rather than with the expectation of successful reproduction. Breeding may be possible for experienced aquarists, but spawning, egg survival, and successful fry development cannot be guaranteed.

Species Identification & Appearance

What is a Chinese Hillstream Loach?

The Chinese Hillstream Loach (Pseudogastromyzon myersi) is a small freshwater fish adapted to rocky, flowing streams. Its flattened body and broad fins allow it to cling to submerged surfaces while grazing on algae, biofilm, and associated microorganisms.

Is the Chinese Hillstream Loach also called Myers' Hillstream Loach?

Yes. Myers' Hillstream Loach is another common name associated with Pseudogastromyzon myersi. However, Chinese Hillstream Loach is a broader trade name sometimes applied to similar-looking species.

Is Pseudogastromyzon myersi the same species as Pseudogastromyzon cheni?

No. They are separate, closely resembling species that have historically been confused in the aquarium trade. Aquatic Arts received these fish identified as P. myersi, and their appearance is consistent with that identification, although definitive identification may require anatomical examination.

How large do Chinese Hillstream Loaches grow?

Chinese Hillstream Loaches sold as Pseudogastromyzon myersi are small fish, generally reported to reach around 2–2.5 inches. Adult size may vary, particularly when similar species are confused in the aquarium trade.

Do Chinese Hillstream Loaches change color?

Chinese Hillstream Loaches may appear lighter or darker depending on their surroundings, lighting, and stress levels. Persistent color changes accompanied by poor feeding or unusual behavior should prompt a closer look at aquarium conditions.

Aquarium Setup & Water Requirements

Are Chinese Hillstream Loaches good beginner fish?

Aquatic Arts recommends Chinese Hillstream Loaches for aquarists with experience maintaining established freshwater aquariums. Their oxygenation, feeding, and habitat requirements make them less forgiving than many beginner community fish.

Should I keep a Chinese Hillstream Loach in a 10-gallon aquarium?

No. Aquatic Arts does not recommend a 10-gallon aquarium for Chinese Hillstream Loaches. Limited bottom space restricts grazing surfaces, feeding areas, and opportunities to create varied water movement. We recommend starting with a 20-gallon long aquarium, with additional space for groups.

Do Chinese Hillstream Loaches need strong water flow?

Chinese Hillstream Loaches benefit from moderate to strong circulation and high oxygenation. They should also have sheltered areas where they can rest and feed away from the strongest current. Creating good oxygen exchange is more important than making the entire aquarium turbulent.

What temperature is best for Chinese Hillstream Loaches?

Aquatic Arts recommends approximately 68–75°F (20–24°C) for Chinese Hillstream Loaches. Stable temperatures, good circulation, and high dissolved oxygen are important.

Do Chinese Hillstream Loaches need an aquarium heater?

Not necessarily. A heater may be unnecessary if the aquarium naturally remains within a suitable, stable temperature range. If room temperatures fluctuate significantly or fall too low, temperature control may be needed.

Should I add Chinese Hillstream Loaches to a newly cycled aquarium?

Aquatic Arts recommends waiting until the aquarium is biologically mature. A tank can be fully cycled without having well-established algae, biofilm, and other natural grazing growth. These fish benefit from both stable filtration and mature feeding surfaces.

What substrate is best for Chinese Hillstream Loaches?

Sand or appropriately sized gravel combined with stable, naturally textured river stones works well. Broad exposed stones provide important grazing surfaces, while spaces between rocks offer shelter.

Can Chinese Hillstream Loaches live in planted aquariums?

Yes. Chinese Hillstream Loaches can live in planted aquariums that also provide suitable water movement, oxygenation, and exposed grazing surfaces. Anubias, Java Fern, and Bucephalandra are practical plants for a rock-focused layout.

Should I keep Chinese Hillstream Loaches in a typical tropical community aquarium?

Aquatic Arts does not recommend adding Chinese Hillstream Loaches to a conventional warm-water community aquarium without first evaluating its conditions. Many tropical setups are warmer and have gentler circulation than is ideal for this species. A dedicated stream-style aquarium is generally the better choice.

Diet & Feeding

Are Chinese Hillstream Loaches algae eaters?

Chinese Hillstream Loaches graze on algae, biofilm, and small organisms living among these natural growths. However, they should not be treated as general-purpose algae cleaners.

Can Chinese Hillstream Loaches survive on aquarium algae alone?

No. Aquarium algae alone should not be considered a complete diet. Chinese Hillstream Loaches require supplemental nutrition, including appropriate animal protein.

What should I feed my Chinese Hillstream Loach?

Offer balanced sinking foods containing suitable plant and animal ingredients, along with natural grazing opportunities. Small live or frozen foods and appropriate gel foods can provide additional dietary variety.

Will Chinese Hillstream Loaches eat algae wafers or sinking pellets?

Many Chinese Hillstream Loaches accept prepared foods, but individual preferences vary. Newly acquired fish may take time to recognize unfamiliar foods. Offer food in accessible, lower-flow areas and monitor whether each fish is eating.

How often should Chinese Hillstream Loaches be fed?

Offer small amounts of supplemental food daily, adjusting portions according to food consumption, body condition, and natural grazing availability. When keeping multiple loaches, use several feeding locations so less dominant fish receive food.

Why isn't my Chinese Hillstream Loach eating?

A newly introduced Chinese Hillstream Loach may be stressed or unfamiliar with prepared foods. Check water quality, oxygenation, feeding competition, and body condition. Provide established grazing surfaces and accessible supplemental foods. Persistent refusal to eat should not be ignored.

Behavior & Tank Mate Compatibility

Are Chinese Hillstream Loaches peaceful?

Chinese Hillstream Loaches are generally peaceful toward suitable aquarium fish. However, they may defend preferred grazing surfaces from other bottom-dwelling fish through brief chasing and territorial displays.

Should Chinese Hillstream Loaches be kept alone or in groups?

Chinese Hillstream Loaches are not schooling fish, but multiple individuals can be maintained together in appropriately sized aquariums. Groups need sufficient bottom space, separate grazing surfaces, and multiple feeding locations.

Should I keep Chinese Hillstream Loaches with White Cloud Mountain Minnows?

Yes, Aquatic Arts generally recommends White Cloud Mountain Minnows (Tanichthys albonubes) as suitable companions when aquarium conditions overlap. They tolerate cooler water, are peaceful, and primarily occupy different areas of the aquarium.

Should I keep Chinese Hillstream Loaches with Zebra Danios?

Zebra Danios (Danio rerio), including Leopard varieties, can be suitable companions in spacious, well-oxygenated aquariums. Aquatic Arts recommends providing dedicated feeding areas for the loaches because danios are energetic feeders.

Should I keep a Chinese Hillstream Loach with a Betta?

No. Aquatic Arts does not recommend this combination. Bettas generally prefer warmer water and gentler circulation, while Chinese Hillstream Loaches benefit from cooler, highly oxygenated water with stronger movement. Their preferred environments are different enough that we would avoid the compromise.

Should I keep Chinese Hillstream Loaches with Goldfish?

Aquatic Arts does not recommend Goldfish as standard companions for Chinese Hillstream Loaches. Although their temperature requirements can overlap, Goldfish produce substantial waste, compete for food, and may become large enough to threaten smaller fish. Temperature compatibility alone does not make them suitable tank mates.

Are Chinese Hillstream Loaches safe with freshwater shrimp?

Chinese Hillstream Loaches are generally compatible with adult Neocaridina Shrimp (Neocaridina davidi) and Amano Shrimp (Caridina multidentata) when water conditions overlap. However, compatibility with adults does not guarantee the safety of newly hatched shrimp.

Should I keep Chinese Hillstream Loaches in a shrimp breeding aquarium?

No. Aquatic Arts does not recommend Chinese Hillstream Loaches for aquariums where maximizing shrimplet survival is the priority. Very small shrimp may be consumed opportunistically, even though these loaches are not specialized shrimp predators.

Comparisons, Breeding & Health

What is the difference between a Chinese Hillstream Loach and a Reticulated Hillstream Loach?

The Chinese Hillstream Loach (Pseudogastromyzon myersi) and Reticulated Hillstream Loach (Sewellia lineolata) are different species. Reticulated Hillstream Loaches are known for their distinctive maze-like markings, while P. myersi typically displays mottled coloration and spotting. Both need oxygen-rich water and appropriate grazing surfaces, but their territorial behavior and care requirements should be evaluated individually.

What is the difference between a Chinese Hillstream Loach and a Bristlenose Pleco?

Chinese Hillstream Loaches (Pseudogastromyzon myersi) are small stream-adapted fish that use broad fins to cling to surfaces. Bristlenose Plecos (Ancistrus spp.) are armored catfish with sucker mouths and generally different habitat requirements. Aquatic Arts would not consider them interchangeable algae-eating fish.

Can Chinese Hillstream Loaches breed in home aquariums?

Captive breeding has been reported for Pseudogastromyzon myersi, but successful reproduction is not routine. Some historical reports involve uncertainty between closely related species. Aquatic Arts does not recommend purchasing these fish with the expectation of reliable breeding success.

Why does my Chinese Hillstream Loach spend so much time on the glass?

Clinging to aquarium glass is normal behavior for Chinese Hillstream Loaches. They use their specialized fins to attach to submerged surfaces while exploring and grazing. However, glass grazing alone does not mean the fish is receiving adequate nutrition.

How can I tell if my Chinese Hillstream Loach is healthy?

A healthy Chinese Hillstream Loach should show normal grazing behavior, steady breathing, and good body condition. A noticeably thin abdomen, persistent refusal to eat, or prolonged unusual inactivity deserves attention. Evaluate the fish's overall condition rather than relying on one behavior.

Shipping & Aquatic Arts Recommendations

How does Aquatic Arts ship Chinese Hillstream Loaches?

Aquatic Arts ships live fish using UPS or FedEx Next Day Air service, with insulated packaging and appropriate temperature protection based on shipping conditions. Chinese Hillstream Loaches should be introduced carefully to a fully prepared aquarium with suitable temperature, oxygenation, and water quality. Orders are covered by the Aquatic Arts Live Arrival Guarantee, subject to its terms.

Would Aquatic Arts recommend the Chinese Hillstream Loach for my aquarium?

Aquatic Arts recommends the Chinese Hillstream Loach (Pseudogastromyzon myersi) for aquarists who can provide a mature, well-oxygenated aquarium with appropriate circulation, established grazing surfaces, and a varied diet. We would not recommend this species for a newly established tank, a small 10-gallon setup, or a conventional warm-water community aquarium that cannot meet its specialized needs.

Shipping Information

Chinese Hillstream Loaches (Pseudogastromyzon myersi) are carefully observed and conditioned by Aquatic Arts before shipment to help ensure they are ready for their journey.

• Shipping Method: UPS Next Day Air for live fish.
• Protective Packaging: Shipped in our insulated Aquatic Arts Live Arrival Guarantee™ Box with appropriate temperature-control materials when needed.
• Weather Considerations: Orders may be held during unsafe temperatures to protect the health of the fish.
• Arrival Preparation: Have a fully cycled, mature aquarium ready before delivery, with stable temperatures, high oxygenation, and suitable water circulation.

Our 100% Live Arrival Guarantee

Every Chinese Hillstream Loach shipped by Aquatic Arts is covered by our 100% Live Arrival Guarantee, subject to our published policy.

If your fish arrives deceased, please complete our Live Arrival Guarantee Claim Form first, including the required photographs and order information. Your submission will be sent directly to info@aquaticarts.com for review by our team.

For complete terms, eligibility, and reporting requirements, please review our Refund & Policy Page.

Acclimating Your Chinese Hillstream Loach

Upon arrival, carefully follow the acclimation instructions provided with your order. Avoid prolonged exposure to shipping-bag water, and introduce your loach to an established aquarium with stable water parameters and strong oxygenation.

Allow the fish time to settle, and monitor its breathing, attachment to surfaces, and feeding behavior during the first several days.

Best Fishes,
The Aquatic Arts Team