i have had a false percula clown for about a week and a half now, and today i decided to add another one. when i did, my old clown swam right up to my new one, nibbled it a tiny bit, then continued it to follow it everywhere. It didnt show signs of any agrresion, it was almost like it fell in love with it. my concern is that, every now and again my old clown will sort of flip onto its side and twitch a little. it never used to do this before until i just added my new clown. Is this common? should i be worried?