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I have never seen this problem, but if your first fish has survived it, that is a good sign that there's probably time to treat the other fish.

Can you tell if your fish has a bent spine? If the spine is bending, that might indicate a disease. (Like tuberculosis?)

Also, have you checked your ammonia and nitrite levels in your tank? If these have spiked, it could be that the droopy tail is an early sign of stress and that the fish will return to normal swimming patterns when the water quality has improved.

On the other hand, if your fish were juveniles when you got them and their tails are drooping as they get bigger, perhaps this is a natural deformity?
 
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