The thing is that they have ALOT of space, i mean just loads of it. Its a thirty gallon tank and Iv piled rocks up all along the back of it so the convict has his own little castle so to speak. He defends it fiercly. I then decided to pile more rock stemming from the middle of the rock wall to 'split' the tank in half. It kinda worked. The convict can get some time to himself but not lots. Im to afraid to get another convict, im not good at sexing and would hate to get a pair of them and lose the firemouth but Im almost thinking Im going to have to just get another convict...The pet store here normally only carries one gender of certain fish to not cause breeding problems so I acually might be safe to get one. Safety in numbers i guess. That wouldnt max out my tank at all. I wouldnt add anymore in but i would think of the tank as done for stocking. I remember last time I had two convicts at once they fought like crazy, I acually had to bring the other back it was so bad, is that normal?