Naso tang with a cloudy eye

[pirate]

As the title say, I have a naso with 1 cloudy eye. It looks like a film over his eye, but only part of it. None of the other fish have it, except my domino damsel is turning white. Everbody else looks fine. They are all eating like pigs. I had a bit of ich that went thru the tank ( yellow tang and the regal)about 2 weeks ago and no one else showed any sign of it.

WhenI checked the water parameters yesterday it was all fine.
ammonia between 0 and 0.5
nitrite did not regester
nitrate did not regester
Temp fluctates between 79 (night) and 80 (day)


I dont have any thing else for testing.

Livestock in the tank

2 false clowns
3 green chromis
1 regal tang 4" or so
1 yellow tang 4" or so
1 naso tang 4" od so
1 bengaii cardnal
2 damsels
1 domonio damsel 3" or so
and a yellow watching gobi pistol shrimp pair
And a very light clean up crew
and some corals

Tank is a 150g with a 40g sump.

Thanks for the help.

[naesco]

Ammonia should be zero.
Have you done anything that could start a mini cycle?
Is the naso a recent addition?

[pirate]

I'll check my ammonia again.
No he's beenin my tank for about a month now and before that he was in my Q-tank for about 2-3 weeks. He never showed any signs of this before. The only additions that I have put in the tank has been some frags. A couple of purple zoas, and pink ones, white star, and a couple of heads of candy cane. All the frags were put in the tank over the last week or so.