I bought one 1 1/2" about 6 years ago.He grew to about 4 1/2" but didn't survive the move. I bought another 4 1/2 so my daughter wouldn't know and she's doing well. I've never had any trouble keeping them except for the occasional battle with ich. I don't treat it, just feed well and she usually does fine. I keep a QT running 24/7 as a "just in case" 'cause you never know.