Put him in the small tank then
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What other fish were in the tank?
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African cichlids. We went to pet supplies plus and they had bettas with cichlids and recommend I get one to add color to my tank. Clearly they didn't know what they were talking about. Poor bettas ?
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Good lord... that's absurd.
Next time please come to the forum to ask before trying to mix fish.
Betta tails have a huge capacity to heal their fins so just put him alone and give him clean water. It will be fine.
For example while sorting my tank out for this betta in the picture, his tail got shredded by the filter flow. He healed up nicely and is the same one that's in my avatar.