I did my last water readings on the 19th and everything was good. But now that you mention clamped fins, I looked real closely at all the fish again. One of my male molly's, he's orange and black and has a really big fanned tail fin. I'm noticing now that his tail fin is not spread out like it normally is. Like he's keeping his fins all clamped close to his body. And his tail fin had started looking a little ragged along the edges, so yesterday I started treating the water with Melafix so he doesn't get fin rot. I don't know if another fish has been nipping at him (I haven't seen any do this), or if he's brushing too hard against the gravel at the bottom.0morrokh said:Have you checked your ammonia, nitrites, and nitrates? Is she showing any signs of disease like clamped fins?