Hi. I have a 90 litre tank currently housing 1 bristlenose plec, 3 balloon mollies (2 female 1 male), 2 albino Buenos ires tetras, 1 silvertip tetra, and 2 rosy tetras. my problem is to do with one of my balloon mollies not being able to swim so well. it doesn't happen so often but when it does she kind of just stays still and her head turns toward the top of the tank. it only lasts for about 2 seconds but most of the time if my albino Buenos ires tetras see her like that, they will try and nip her fins. when I first got her they were really nipping her a lot and her tail fin nipped got a quite but what they nipped has grown back. its definitely not swim bladder because she can easily swim otherwise.
I'm quite new to this and I'm only 11 so please no mean replies.