Just keep an eye on him is all. I had a lot of hope for mine as well but it didn't work out. Mine also was going about his normal business, hanging on the glass and munching but he still was dying. :-(
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.