Tail redness and blister

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dschloef

Aquarium Advice Newbie
Joined
Nov 27, 2020
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1
2 days ago my goldfish developed redness and a blister. The blister popped yesterday and now has a white growth that falls off and comes back again. Did 80% water change and test shows 0 ammonia, 0 nitrite and trace nitrates. Anyone know what this could be?
 

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