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joey'd is da man
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14,077 Posts
Personally I would do a 30% water change every 2 days for 1 week, adding 1 tablespoon of salt for every 5 gallons.
I would hold back from medicine, because of your piranha with a black spot, which might need treatment and mixing meds is not a good thing.
 

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joey'd is da man
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14,077 Posts
That is not too bad advice, I don't know if you really need to scrub everything, but I guess it won't hurt, unless your tank needs to re-cycle.
could the black spot be a fish louse?
 
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