Hi, I came home today to find one of my mollies stuck to the back of the filter (a small rena filter). I very gently moved the fish & could see it has been quite bruised/looks like bleeding under the surface. Seems to be swimming ok & well in general, but obviously I'm concerned at this happening again & wondered if I shouldf do anything to treat the fish at the moment? I have had fish a couple of years but am fairly new to the hobby.
Thanks
Thanks