I've got a fairly new 55 gallon, in which I have a mix of mollies, tetras, balas, crayfish and tiger barbs. I've had this striped black and orange tiger barb for awhile now and just a few days ago I introduced a new tiger barb, well two, but one died almost immediately....anyway, it is of the mostly green/emerald variety. The orange tiger barb constantly chases around the new green tiger barb. At first it seems they got along great, as a matter of fact, the green tiger barb always seemed to want to school with the other but now if they get anywhere close to each other, the orange tiger barb chases down the green one for a long time. It seems like it tries to chase it to the other side of the tank and then leaves it alone. And then when the green tiger barb gets the courage to come back, it gets chased back again. My orange tiger barb gets along perfectly with all the other fish I named above. No one even flinches when he comes near. But it seems he really hates the green tiger barb. Obviously, if this keeps up I need to get rid of one, I don't want to torture the green one to death. But which one should I get rid of??? Should I get rid of the aggressive orange one, or the new green one that is the victim of the aggression?