You may want to try the Pedialyte for appetite.

I made a small bath of 1 cap of Pedialyte to 10 caps of clean treated water. Baths no more than 2 hours. I soaked CJ and Dunkin like this while I cleaned their QT tank. Dunkin had not eaten for 7 days. I don't know what they had, but I treated with M2 and MarOxy, and restarted their tank with a new filter system. Dunkin has gotten very fat again. I look at him on a regular basis with magnifiers to make sure its just fat :)

Good luck !!!

~Mac