I had my rbp's since they were 2-3". I have 6 of them and none died. I thoguiht that half would die but they all leave. RBP's are hardy fish and rejuvinate fast. They're housed inb a 55g tank w/ a 11" oscar. The rbp's right now are 6-7". Now, I am totally bored w/ them and thinking to sget rid of them and get a cichlid tank.