I thought Epsom salt was bad for fish.... it could be a burn you mighr want to do some water changes to get that salt out of there.
*Sigh.....duck* No Epsom salt is not bad for fish. Many people use it to treat fish for many different reasons...
That Epsom salt should be fine, I have used it in the past with no problems. Did you check your Ammonia, Nitrite, and Nitrate levels?
