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My guess is that he is ripping his fins on some of the decor.

Take all the decor out of the water and run a pair of panty hose over all the decor (including the jellyfish thing) and if it snags then it will rip is fins.

It also concerns me that you do not have plants (live or silk) in your tank. Bettas prefer tanks that are heavily planted and do like open water. Since that stresses them out.

It is also possible your boy is tail biting. Your photos are clear enough to tell if he is or not.
 
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