Mine is in a 20 long with my baby silver aro. I want them to both put on ATLEAST 3-4" before I move them again, as the Pbass and Pacu take all their food before they can get to it. I may just keep them seperated. Well, keep the RTC seperated, I don't need him eating my other fish. I have been lazy lately and havn't had the ambition to cut up some more tilapia for him. I will do that tomorrow probably. I would like to see him at 12" by May. Maybe before that.