Betta Missing Chunks From His Tail

Odin

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Hi when i got home today and had a look at my dumbo halfmoon betta I noticed he was missing chunks from his tail, so I tested the water and the readings were ammonia-0 nitrites-0 nitrates-5. He currently lives in a 5 gallon planted tank alone and he has no hard decor to potentially damage his tail on so I have no idea what may have caused i
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t. Any help would be greatly appreciated
 

LilBlub

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Are you sure there’s nothing in the tank that he could’ve torn it on? Sometimes bettas are just clumsy and rip up their fins on things. Sometimes very unlikely things!

If not, it’s possible that he bit them. Longfin bettas are prone to fin biting.
 
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Odin

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Hi thx for replying there are no hard objects with sharp or rough edges he could of torn it on, if he did bite bits out himself what would cause this?
 
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Odin

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Would that be caused by his reflection?
 

Thunder_o_b

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Some bettas are tail biters. As said above could be stress or he feels the aquarium is too small. Or you could just have a neurotic fish. It does happen.
 

LilBlub

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Sometimes bettas figure out that they can swim faster if they bite chunks out of their tail, so they continue to do it. But it doesn’t seem like fin rot, because your parameters all seem fine.
 
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