I started with 2 clowns and after 3 months I got 2 more. The first 2 clowns were always fine with each other and grew to the same size. When I got the other 2 (which are much smaller of course) they were ok at first but now they are fighting? The older, bigger clowns leave the little ones alone and don't even seem to realize that they are there. The 2 smaller ones are always running around the tank scrounging for food until they meet up with one another then they start this weird upside down dance and rub against each other then nip one another.... any thoughts?