So the fluid retention appears to be in the head and eye area - but not around the abdomen? Is that correct? Look at him from overhead. Is there any sign of bloating or pineconing around the abdomen or midsection?
Your dosage of 1 teaspoon Epsom salt per gallon was a good call.
If there is pineconing in the head (but not abdominal) region, I would treat this as an external infection and use a gram negative antibiotic. Again, your call of Jungle Fungus Clear is an excellent choice. It contains two furan antibiotics which are effective against gram negative bacteria.
Edited because we were all posting at the same time.... Yes, Maracyn 2 is another good gram negative antibiotic. Maracyn is a gram positive antibiotic, which can be combined with either Maracyn 2 or
Jungle Fungus Clear.