I tend to have problems with these fish, but that was because it was hard to feed them. They're better off in a species only tank, or in a tank where other tankmates won't compete with them for food. The reason for this is that they really really reallyyyyyyyyyyy slow at food. They'll look at food first, then if they consider it food, they'll take a nab at it. Otherwise, they'll just ignore it. That's the problem I had with mine. They're better at live food. Give it time though, then they'll go for frozen things like frozen brine shrimp.