BLIND CAVE TETRA (Astyanax mexicanus)

Hardy and peaceful, it’s actually an excellent choice for the beginner and suitable for most community aquaria, though very shy or sluggish tankmates are best-avoided. It sometimes nips at tankmates when feeding, but this is more attributable to its searching technique than aggression. Although it can’t be described as gregarious it doesn seem to fare better when maintained in a group and we suggest the purchase of at least four individuals.

https://www.seriouslyfish.com/species/astyanax-mexicanus/