I bought 2 new fish today, a long-finned black tetra and a bleeding heart tetra and I added it to my tank that already contained a dwarf gourami and a school of smaller tetras, with 2 kuhli loaches and shrimps. I thought a gourami fish was supposed to be peaceful? I have to quarantine the gourami four times because it was chasing the two new fish and attacking them. Will the gourami get used to the new additions and tame down, or should I just get rid of it?:help: