The point is that lake fish are designed to have room, to find food, shelter, and the the correct temp. It is almost impossible to duplicate this in a tank and for any chance at all you have to have at least 125 gallon tank. I was just suggesting that the shiners felt cramped and ganged up on the weakest member in some sort of population control device. What would happen if you put 8 dogs in a closet? They would fight. Maybe the fish felt the same way? Just a guess.
