I've had a Rosey Barb for a couple of years. He became too aggressive so I moved him to a yard pond where he stayed until I shut the pond down and I gave him a second chance in a new tank I was cycling with a half dozen zebras. Strange, for the month he was in there he NEVER bothered the zebras which were 1/3 his size. When the new tank was finally ready I removed the zebras and put them all into another tank. I thought he would also do well with the small cichlids I used in the new tank. No. He immeadiately began chasing the smaller ones. I tried him in yet another tank and after two hours he had bitten off almost all the fins from a betta. He hadn't bothered any of the other species but the poor betta looks terrible now. That's the last straw. Last time I saw Rosey he was headead to his new tank in my back yard. UNDER my back yard, the septic tank. Can't say I didn't try.