here's my situation. I have 2 angels and have a long finned rosy barb. I bought 3 tiger barbs and put them in. My rosy barb started acting crazy and would swim fast and rub up against the tiger and appeared to keep pace with it and then switch off to another tiger. I could not tel if the Rosy was nipping or just excited and was trying to join the crowd. I have the rosy separated right now for a few days, then i will try to reintroduce. In the mean time, what do you think?