I always thought the black flecks were black spot parasite, i've seen other fish with them and in an aquarium it goes away on it's own because the parasite needs a water bird as an intermediate host, with out the bird it can't complete it's life cycle and just dies off, fish gets black spot,(larvae) bird eats fish, parasite pupates in the birds gut lays eggs,defecates in water eggs hatch,larvae attach to fish,, cycle starts over
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