Bought 2 a few years ago, one for my guppy fry tank, the other for my community tank, the fish keeper said, Yea they are happy fish good for the community tank. They were fine in both tanks. Then 3 months later, i bought some sword tails for my community tank, the blasted thing killed all 3 within a day. The one in the fry tank was peaceful all the time (although there were sooo many babies, i wouldnt have seen the odd 1 or 2 eaten)