This fish is in bad shape. It's got frayed fins, loss of scales and skin, and is very thin. Note that it is even thin above the lateral line. I'd remove the fish to a quarantine tank, and try treating it with antibiotics. If it gets past that, it's going to need a lot of good foods, especially algae to get it back to health. I'd say your chances to do that are not good, but sometimes you get lucky.