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Do you have any tank-mates? It could be a nipped fin.
 

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I don't think that's not fin rot. Fin rot is usually preceded by black or red edges to a fin, then the fin just falling away like it has disintergrated. It's not that neat. It looks to me like he has either caught his fin on something in the tank (test all your decor for sharp edges - if it snags a pantyhose, it will damage his fins) or has done a spot of tailbiting.
 
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