My 2 Limas one is about 6" other is about 4 1/2" are fighting. The larger one wont let the smaller one hangout with him, the smaller one keeps trying to swim in the current with the bigger one but the bigger one will push him away and try to bite him. The smaller one was getting to large for the tank at my moms work so I rescued him, he was on feeder only diet and he hasnt tried to eat any of the shrimp or pellets I feed the fish. Any ideas? should I get another lima to help out?