DeLgAdO;729693; said:heres what i would have done:
isolated him in a seperate tank (if i did have one id run to target and buy a 55 gallon rubbermaid)
maintain temperature at 83F
some salt at 1 tablespoon per 5 gallons ( salt helps with osmoregulation, freshwater fish lose salts when they are stressed)
do melafix and pimafix treatment for about 10 days
try to get him to eat and adjust to his new feeding technique