i have two bnose catfish, one of them's bigger than the other and the bigger one seem to be always bullying the smaller... there is this cave in the tank and the big one is always inside it (the smaller never goes inside), and sometimes the bigger one would chase the small one around. when i feed them algae tablets, the bigger one will sort of 'sit' on top of the tablet so the smaller one can't get at it... what should i do?? i can't really seperate them coz i only have one large tank.... the others are really small... like 2 gallons...