Hey Seth...looks either bacterial or perhaps a fluke (I really don't see any other evidence of flukes on the fins, but this is commonly what they will look like if they get around the eye).
If it's bacterial, it may go away by itself. Make sure your water quality is top notch so as not to irritate the eye more. Google Beta Gluten and see if you think that's an option as there's evidence that when added to the food, helps fish heal up quickly (I use it myself for my fish at home). You should be able to get it from any health food section. It's said to boost a fish's immune system to help fight off disease and infection.
My male bellus had a cloudy eye last week after the move to the new 215, but it cleared up by itself in about three or four days. Sometime the stress of trying to catch it will just make the problem worse.
MY GSM developed a very similiar eye problem about 3 years ago when I moved to a larger tank. Hers didn't clear up after about a week, and I couldn't catch her (she was my first fish ever so I was panicked I was going to lose her)...so I treated the tank with Melafix. I don't really recommend this as there are some that say they had some feather dusters and a few inverts that didn't make it through the treatment, but I've never had a problem and I've used it several times for extreme situations. But it is there as an option if you get desperate. Yell if I can do anything to help and please let us know how everything turns out!