omg if you have that big of problem keep them 6 or more like everyone is saying, i have 6 tigers with 4 small blushing banana barbs, and when i put them into the tanke all the tigers went right to them to like not really nip but taste rather, and got 1 nip in and then now there shoaling together there all happy, if you have a problem with 1 tiger barb take him back, and get another, trust me, you'll get over it