Question: is epsom salt bad for fish?
Answer: I use Epsom salts (Magnesium sulphate) to treat aquarium fish with Dropsy, Constipation or Bloating . Epsom salts will not effect you filter bacteria within your aquarium. Dosage: 1/8 flat teaspoon per 5 US gallon within aquarium. 1 flat tablespoon per gallon for 10 minute bath.