Emerald Dwarf Rasbora Care Guide

Celestichthys erythromicron, the Emerald Dwarf Rasbora, is a delightfully small denizen of Aquatic Arts, and many of our customers aquariums. While this species can be timid in a sparsely decorated tank, it becomes more adventurous when kept with plenty of live plants and in larger schools. Because of its diminutive size many more specimens can be kept in relatively small aquariums than one would think. Given adequate maintenance and plenty of care one could easily keep 24-30 of these in a 20-gallon tank. With abundant emerald and blue hues these fish are sure to wow and stand out in any appropriate aquarium, and particularly so among red leaved plants. Furthermore, due to their striping, these fish make amazing displays when schooling. Given the fairly rigorous structure of their social hierarchy one will often find males dancing and competing for female attention, regularly flashing their colors to show off. Do not worry though, this sparring very rarely leads to outright aggression and this species can be considered exceptionally peaceful for all intents and purposes.

Care for this species is simple, as they show a high level of adaptability in water conditions, lighting and tank size. However, like many small species of fish, these do best in stable water conditions. Small weekly water changes are often the best way to accomplish this in the home aquarium, but we have reports from customers whose tanks had crashed, leaving only Emerald Dwarf Rasboras left. Below you will find water parameters we have found to work well for this species:

Temperature: 70 – 75F (21 – 24C)

pH: 7.0 – 7.5

KH: 7 – 10 Degrees

It is worth noting that this species is generally adaptable as far as temperature and pH. If needing to acclimate to slightly different parameters this should not be a problem, short term or long term. Feeding this species is also easy, with them routinely accepting prepared foods. We currently use a blend of our Aquatic Arts Brand flakes, Omega One products and frozen foods to ensure complete nutrition. As with all animals we sell, we strongly encourage our customers to feed a variety of food types to ensure all vitamins and minerals are adequately provided for. Due to this animal’s small size it would also be recommended to feed multiple times per day, in small quantities, as their body simply cannot store a large amount of reserves.

Tank mates can include nearly any fish that will not pose a threat to these small fish. We recommend keeping these in a large school, but Celestial Pearl Danios, other rasbora species and small catfish also make good community members. These are also considered dwarf shrimp safe and make wonderful additions to shrimp tanks. It is very unlikely these will pose any threat to anything but the smallest of animals.

Sadly, like many aquarium species, this animal’s population is in steady decline in the wild. Being endemic to Lake Inle in Myanmar, this species is faced with habitat loss due to human factors. With that said, Aquatic Arts only offers specimens which were raised in captivity and as such can provide you with healthier specimens which in no way affected the wild populations. We would encourage everyone to ensure they only source these from certifiable captive bred populations.

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