Fish with a black spot and black on edge of fin


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My fish were put in stock tanks while the pond was being redone. I happened to test the water and found out the PH and Ammonia etc. were all off the charts- so I know the water wasn't clean. Anyhow, when putting them back, I noticed one had a black lesion looking spot on it, and its fins had some blackening around the edges. I know this wasn't there before, it happened in the time it was in the dirty stock tank.
I'll try to post a photo but it isn't a very good one. I don't think I got one of the lesion on its side, but you can sort of see the fin issue. Thanks! T
2015-09-04 15.59.52.jpg
2015-09-04 15.59.52.jpg
2015-09-04 15.59.55.jpg
2015-09-04 15.59.52.jpg
2015-09-04 15.59.55.jpg
 
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The black coloring can be a sign of healing from a burn which could have been caused by an ammonia spike.

As long as your fish is acting fine otherwise I would just keep a close eye on water parameters.
 

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