First off a few months back I found her with black spots, rotting away, hiding behind the tank decor. Medi-tank with Melafix saved her life but her left eye is flattened and distorted, giving her that sad look. Also her tail is pretty messed up on the left side as well. The first picture is of her "good side", then the second two are her bad side, hopefully the tail (rot?) is visable. The last picture is what she has been up to for the last few hours, rarely swimming around. Everyone else seems healthy in the tank, the nitrates are testing high @ 160 on the test stick, and I'm going to do another water change and have tried adding some live plants to try and bring down the nitrate levels, but does any one have any thoughts on the nature of Angeline's malady?

How big is the tank and how many fish do you have in it?

Your fish doesn't have fin rot, but it's very common for fish to get ripped fins when the water quality is bad. Which it is, due to the high nitrates. Instead of buying nitrate absorbing products, I'd go to the bottom of the problem, which could be one of the following:
- Too many fish in too small tank
- Too small filter
- Inadequate maintenance
- Overfeeding
...or a combination of them all.

If I were you, I'd try to repair the issues with the water first, as in, doing a huge water change of 75% with thorough gravel cleaning, and start feeding the fish with some medicated anti-bacterial food. Feed that, and only that for 7-10 days or more if needed. As soon as the water is alright again, the fish should get better too

The girls have covered it all above please take care of these beauties of yours immediately to avoid further illness. You have some stunning ryukins it would be a shame to lose them.

well, I cleaned the tank and did @ 2/3 or so water change, some salt, everyone is looking like they are enjoying their freshly cleaned environment. Even "Angeline"  is a lot more active and is swimming all over the place. I am using the test sticks so the 160 may have been lower in reality...I will check it right now. Testing 40, or in the high "safe" zone, so that's good for whatever it's worth!     Here are some quick snap shots. It's a 60 gallon tank with 8 fish altogether, so they should be ok for a while yet, I think I put off the cleaning too long, and the nitrates got out of hand. Still don't know what Angeline had in the first place, I hope she, I mean he, will be ok, I read fins are supposed to grow back, but I don't know about eyeballs. 

salty-J: Long time no hear.
Just follow their golden advice and your beautiful fish will be okay.
What I do now is change 40-50% of the water twice a week since my goldfish are bigger. Also, I don't have heavily planted tanks.

As Minde said your tank is a bit over crowded so you will have to keep a very close eye on water quality! You may have to do bigger water changes more often. I still believe nitrates are too high at 40, no matter what the test kit says  So maybe you could do another big water change in the next few days to get them lower? With 8 goldfish in a 60 gallon tank this may be hard but worth it for your fishies lives

Ugh I couldn't imagine that Nossie. It would seem like torture I've seen the difference of how Sunshine and Clementine both act compated to nitrates at 20 to 40. It would be horrible to see them in anything higher!

Aw when did that happen Nossie? Glad she got better

Andrea: I moved her back in the beginning of this week, so it was almost two weeks ago now