What is wrong with my molly fish? It is alive, but missing its back fin and beginning to deteriorate further, also it is swimming nose down. - Quora
Clamped fins - Diseases - C.A.R.E.
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Balloon Molly With Clamped Fins.
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Why Did My Molly Fin Color Changed?
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FAQs on the Molly Behavior
New Molly constantly twitching. Rubs self against rocks, clamped fins half the time. Other fish are fine. Not sure what's wrong. This video is new kissing the surface behavior + big twitch. :(
Clamped fins