So I started off with 3 tiger barbs.....then added 3 albino tigers to even out the aggressiveness of the first 3. The school immediately settled down and the nipping of other tank creatures went down drastically. Recently though I've noticed that two of the regular tiger barbs are sparing (body slam kind of sparing and the one will chase the other off), is this indication of the tigers setting up rank in the school or is this just typical of them playing around