sounds like NTD, pleistophora hyphessobryconis
say goodbye to your tetras
this disease will attack quite a few species including cardinals, neons and black neons, maybe even gold tetras
furan-3 SAYS it cures NTD but ime it doesn't
but you might want to try it anyway
so far there isn't any reputable confirmed cure for NTD
if you can, isolate the infected fish and euthanise them, and watch the remaining ones, and cross your fingers
but usually the whole tank is infected by the time you see 1 fish with the symptoms
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