A week ago, he jumped out of his tank and crawled across my carpet giving himself scratches on his belly and feet. He got fungus on his feet so I gave him a salt bath treatment. Once the fungus was gone and he was acting healthy again, I put him back in his tank. That was a couple days ago. He has been acting normal and showing no signs of stress. I checked him today, and I noticed this huge hole in his belly. I don't know if something is eating away at him or what, but I have no idea what to do.
try calcium, the cuttlebone shaved up, some good food and TLC