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check your water quality, high amounts of nitrites or ammonia causes corrosion that causes necrosis of the fins and scales, my last betta I put in a quarantine tank that apparently was unmaintained for way too long and he turned black and his fins and scales crumbled off like dirt. Apparently the last fish i put in that tank died, decomposed, and got buried in the gravel without my knowing. Decomposition = atrocious levels of ammonia. Put some extra doses of water conditioner and stress coat, it should help out. Does it look infected at all?
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