Eye falling off?

[dseiler]

I have a yellow eye tang in a 55 gallon reef. All of the water perams are perfect and I have added nothing new in months. I noticed today that tang's eye looks like the lense is falling off and that there is another eye underneath that is "growing in". Everything else in the tank is perfect and has been for a long time. Any ideas anyone? I am a little freaked out.
Thanks in advance.

 

[beth]

How is the fish doing besides the eye situation? Swimming, breathing, eating, etc.?
Is the eye bulging?
Have you noticed any aggression going on in the tank?

 

[dseiler]

Everything else is fine. Eating, swimming, breathing. There is no real agression. The fish chase eachother from time to time, but it is not mean at all.
Everything is great oter than that.