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This is fin rot. Fin rot happens when fish are under stress, such as from poor water quality. Make sure your ammonia, nitrates, and nitrites are at low levels (the test will say what is acceptable). Ammonia should be no higher than 0. If they are higher than they should be, water changes and an ammonia removing product such as AmQuel will bring them down. After you have fixed your water quality, buy an over the counter antibiotic to rid the fish of the bacteria that managed to attack it while it's slime coat was messed up.

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17y ago

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