Tomini Tang - White spots on face

[FlyingFishSKYw]

Refer to the picture. These white spots have been appearing for the last several weeks.

I've had the Tang for over a year in a 4 year old tank. He's acting and eating normal. I introduced a couple new fishes about 6 months ago and he was aggressive towards them, but once his dominance was defined there has been no other aggression.
SG 1.026

Any ideas?

 

[Bent]

That looks like HLLE...

 

[FlyingFishSKYw]

Could be... Thanks!

http://www.reefkeeping.com/issues/2005-06/sp/

 

[Bent]

No problem.

Just FYI some people are trying to connect the use of GAC to HLLE. So if your running a carbon reactor you might try stopping it.

I think it's all theoretical at this point, but there are some good arguments made on both sides.