Damn annoying hippo tang

[trilinearmipmap]

I have had a small (2") hippo tang for 2 or 3 months now.

He has broken out in spots on and off but never seemed sick.

At first it was one or two spots that looked like "ich", then they would go away for a week or two, then they would come back.

Lately he has spots on him all the time, 3 or 4 spots at a time. The spots are different colors and shapes, white or brown, one spot was black.

No other fish in the tank have spots.

I don't know what kind of disease this fish has.

All water parameters are where they should be, no detectable nitrates. The tank is undercrowded.

Lately I have fed nori soaked in garlic daily and it made the spots get worse. So much for alternative medicine.

My worry is that I stock up the tank with more fish, then a disease outbreak happens that wipes them all out.

Anyway I have several choices here:

Choice A: All fish into a quarantine, treat with hyposalinity and/or medication and keep the reef tank empty of fish for two months.

Choice B: Ignore the problem and hope that it will go away.

Choice C: Euthanize the hippo tang to save his tankmates from getting sick.

Other choices that I think won't work are:

Choice D: Remove the hippo tang and medicate him -- he will just get sick again when he is put back into the reef tank.

Choice E: Medicate the reef tank -- not advised by most people.

Someone suggested neon gobies but J & L has none in stock.

Any input or advice would be welcome, I am leaning towards choice A or choice C.