This is weird. I just did 1/4 water change and cleaned the bottom. Added a new bubble bar, some declorinator to the new water and some tropical fish food pellets (new). Now my black mollie can't swim. She/he's pointing downward with it's head down and tail up trying to swim tot he bottom, but can't it's like it keeps floating to the top. Also, it looks like there is a kink in it's body. Almost where the last lttle fin on the underside is, it looks like it's body is bent. HELP