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Discussion Starter #1 (Edited)
Came home this evening to find that one of my Zebra Danios has lost the upper half of his tail! He was swimming alright, but when he stops, his posterior droops noticeably. I wonder whether he is the victim of a bully in the tank (only three other Zebra Danios in there with him) or whether he is ill (e.g. Fin Rot). The lot of them were exposed to very high NitrIte levels for about 10 days as the tank was cycling. Ammonia and NitrIte have been zero for the past four days, but perhaps I'm seeing the latent effects of that stress.

Have you seen this malady? What can I do to help the little fella?
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A big water change would help give that zebra a quick recovery from that tail injury along with some melafix used as a natural antibiotic and wound healer. Unless it is very bad, you might have no choice but to use strong antibiotics.. Any pictures?
 

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High nitrite or ammonia and ph shock will cause fins to disintegrate. Fresh water is your best medicine. I've had fish with tail damage worse than that make full recovery in about 2-3 weeks with no medication. Not to say don't use medicine, just to reassure you that your fish should be fine IF you provide perfect water
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