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Could also be fin rot. You may want to consider a PimaFix and MelaFix regimen.
My Cardinal Tetras got this when I relocated my aquarium downstairs. I think the move stressed them out. One's tail was reduced to a stump--it went from perfectly healthy to dead in about 4 hours. The others all pulled through though after medicating them.
My Cardinal Tetras got this when I relocated my aquarium downstairs. I think the move stressed them out. One's tail was reduced to a stump--it went from perfectly healthy to dead in about 4 hours. The others all pulled through though after medicating them.
