I have a jack dempsey in a 50 gallon tank by himself and that tank has never got brown algea befor(tank has been going for about 1 year) and now its starting to get it on the rocks and the glass, but the problem is i cant put any algea eaters in with him cuz hes one mean S.O.B he kills ne thing i put with him(probly because he was raised in a tank by himself) but am i pretty much SH** out of luck and just have to clean the rocks and glass??? or are there ne suggestions on what fish i can put in with him to eat the algea??