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Well for about 3 days i didn’t see any black spots they have now returned formalin is bought on amazon? And used as a bath i take itMost black ich lately is prazi resistant.
You will want to treat the fish with formalin.
However, make sure you aren't seeing scaring. If the spots were completely gone during treatment, it's likely not scaring.
The best way to be sure that the worms are completely gone is to put a white Molly in with them to be sure they are gone.



