Fish Disease

Well, the last few days i've been having problems with my goldfish as far as the tank has been really cloudy. Which I don't understand why cause I have a filter, I do weekly spot cleans and I test the water levels about 1 a week or 2x a week. Depending on my mood. Anyway, I even went and bought a new filter cause I thought that was the problem. So yesterday I'm going to put in the new filter and look at my fish and this is what I see....

Now mind you, this is not my fish, but that scared the hell out of me! Look how nasty it looks! Then to have 2 of them looking like that! EWWWWWWWWWWWWWW

So I call the petstore and they tell me they have pop eye disease...http://www.fishdeals.com/fish_diseases/pop_eye/ if you want to check it out. So basically I went back to the petstore to get the antibiotic to put into the tank, I have them in a 'hospital tank" and i'll clean out the big tank, get it all sterile again, let the filter run for a bit with the meds and then i'll put them back in it. For now they are in a small tank with the meds, and hopefully it'll work.

Worst case scenerio, they will die, or could be left blind! We'll wait and see! Anyway, that's what is going on now! Always something!