Since the weekend I've set up a 10 gallon tank with three Tiger Barbs and a Corey catfish. Yesterday I noticed that one of the Tiger Barbs took complete control of the tank and the other two were actually hiding up behind the filter. So, I got three Albino Tiger Barbs and threw them into the mix to see if that would spread out some of the attacks. All was fine until this morning when I saw that same Tiger Barb picking on the three new Albinos, while the other two original Tiger Barbs hid behind the filter, this time with the Corey. Should I add a few more barbs, or should I get rid of the feisty one?