I have three (dario dario) there is one in my avatar. Only problem with them is feeding, they eat some frozen food, bloodworm as long as they see it moving but don’t take flake or any other prepared food for me. They are quite slow by comparison to other fish and really small they stalk the food. They like lots of plant cover and are quite shy. I have three all male (no females in lfs) in a four foot community tank with fish that don’t bother the darios. I have had them about eight months, they are very stunning little fish.