Hi I have asked this question in the other pets forum and haven't got any reply's,so I thought I try general discussion.I have a 420 gallon tank with large fish Gator gar,red tail Guarami,giant flagtail,Osca,24 Arow and other fish bigger than 10 inches.the turtle is a male and they are suppose to get 9 to 12 inches in shell size.So far had it about a month and a half and have had no problems.He is about seven inches now,has anyone kept them in the past with fish?