My Molly is swimming around my log, swims normal and is active. When I first got them the blacker one was the first one to eat, now he kind of just hangs back and waits for it to fall and the whiter one sat back and waited. But now they've totally switched. Then I caught them doing this last night and thought it was just them fooling around until I came home from work today and saw the blacker one doing it again. Also noticed some vertical swimming head up, not very often. Should I be concerned? I have a video on my iPhone but don't know how to up load it. Hard to describe without the visual if any one can tell me how to upload that would be awesome!