Hey Mario,
I think these might be juvenile yellows and they are possibly been subjected to black spot, caused by metacercaria (which is basically an external parasite)? Quite commonly found on yellows, especially in winter. As for the red spots, also found on them but don't ask me what that is, possibly also a form of parasite that attacks cetain areas on the fish. The red spots I find on our vaal yellows, generally always seem to be located on the same areas of each fish.....wierd but just a guess
Not sure but it could be....
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