I had three that were 4". They were fine when they were smaller with just a few squables here and there, but as they got bigger they started picking on my favorite one. Everytime he would try and get some food they would attack him. I was going to take the two mean ones to the LFS for some credit last saturday but I had to do something else and had to put it off. Long story short... Monday I took one backEgon;3906988; said:I had one years ago and liked it. Can you keep more than one in a tank? I never see more than one per tank?