Beginnings of HLLE?
 

My kole tang is starting to get spots around it's nose.
I've had it for over a year.
Eats pellets, brine and mysis like a pig, and picks at the rocks.
Pellets are soaked with selcon before feeding.

Anything else I can do to supplement feeding? or to the tank?

Is he stressed? Check for stray voltage and feed him lots of nori. Soaking with Selcon is good. How much carbon are you using and what brand? Carbon has been possibly linked to HLLE.

Oh I forgot one: What is the condition of the tank water? Poor water quality may also be a factor.

Water seems to be good, exception of hair algae problems, but they seem to be going away slowly.

Using marineland carbon.
no stress or voltage. always seemed like a happy guy. no one bothers him, he doesn't bother anyone else.

tankmates are all peacefull, except an allens damsel, but even he doesn't bother the tang.

I recently bought a tub of ROX carbon. Was going to switch that out next batch when I find a good bag to hold it. those are some damn small pellets.
I run it in a cannister filter just for carbon cause I have nothing else to hold carbon.

where did you buy the rox in vancouver?

I didn't.
Group buy a month ago from BRS.

ROX is great carbon, expensive but very good.

I reused the bag from some Chemi-pure I was using, works great.

the marineland carbon you're using now, is it pelleted or shards? Are you running it passively in a bag or in a reactor? just wondering as poontang was running a brand of carbon (which I think might have been marineland or something like it) through his reactor too fast and I think it was being ground to dust that was making it into his tank. His coral beauty and purple tang both exhibited signs of HLLE while I was tanksitting. He has since switched to a different brand of carbon (I hope).

The carbon in question was black diamond and I had it tumbling too fast I think. The coral beauty has healed somewhat and the tang is fine. I am now running Marineland but have the reactor turned down enough so there is almost no tumbling.