Nichole,
Try lowering your hosp tank temp slowly to about 70F and have at least two "open airlines" ,no airstone in the tank. You want good circulation and lower temp.
I have done this for external bubbles without subjecting the horses to a barrage of meds. if they are not necessary.
Naturally there are times when meds are necessary but there are also successful and simple changes that can be made in a tank that can solve a number of problems.
Good luck with your little guy.