I have a juvi Antennata Lionfish (Pterois antennata). Sorry for the copy paste from DF&S (not a direct buy from said site) but it's better to be exact. Trouble is... he is in my quarantine tank and over the last 72 hours his right eye has become cloudy. I have had him for about 3 weeks ion this tank, and have been trying to ween him onto prepared foods. All environmental parameters are within order, they mirror one of my reef tanks specs. If you could please lend some advise, it would be great.

I guess, the first thing you should do is post your parameters. In order isn't enough to really go on in this case since many fish have different notions of the perfect range than the people trying to keep them. Your problem might be as simple as a sudden, small, change in pH, or the guy could have a little bit of an infection. Posting the exact numbers of your parameters will help people more knowledgeable than me give you a more helpful answer.