I personally would do a water change and then add Epsom. I should really help. I like to also add frozen brine shrimp and that will work as a laxative and stop feeding any pellets.
what's the dosage for epsom salt for treating the tank? I keep seeing different dosage amounts wherever i look. Some say 1/4 teaspoon per 10 gallons all the way up to 1 tablespoon per 10 gallons...???The epsom soaked pellet will only work if you are trying to treat for an internal parasite. An epsom salt bath will draw out fluid and will reduce swelling. I wouldnt remove fish from tank but add to main tank as long as your other fish arent salt intolerent. What do you feed this fish?