White spots

[iluvtrigger]

I have a question, my naso tang has a bunch of white little spots on him when the lights are off, but when they come on the spots seem to vanish and no sign of spots, should i be concerned. Or is this something naso tangs do?

 

[iluvtrigger]

Can someone please help me.

 

[astrogazer]

Sounds like ick, if you could post a clear photo it would help.