Cloudy eye - can't get rid of it

[Tango374]

He's had it for a long time. Not a serious case, as in you can barely see the retina....He just has a slight to moderate cloud or milky fog covering both of his entire eyes.

I'd say he's had it for well over 6 months. Cloudiness clears up 75% of the way after a good water change but returns within a half day.

I increased water changes to 50% every Sunday. After a month with no improvement, I upped the 50% water changes to every Sunday and then again on Wednesdays. After a month, no improvement.

Two weeks ago I dosed aquarium salt and have added the salt needed to replace the water coming out during WC's. No improvement.
One rounded tablespoon for every 5 gallons is what the directions tell me on the brand of salt I'm using.
http://www.bigalspet...salt-33-oz.html
Equals out to about 15 tablespoons for my 75 gallon.
Given the amount of substrate I'm using, I dosed 14 rounded tablespoons on the first dosage. Then I'm dosing 7 tablespoons for every 50% water change I do.

Last week I began dosing Melafix at 75% the recommended
dosage...no improvement at.

PH - 7.8
Ammonia - 0
Nitrite - 0
Nitrate - 5
GH - 8
KH - 4

Got any ideas?
I'm nervous to go to hard drugs so I started with Melafix. This didn't even help a little bit, so I'm thinking the hard stuff starting at half (maybe 2/3 or 3/4) the recommended dosage is where I might end up, water changes is just not clearing his eyes up.
Looking at Furan-2
http://www.bigalspet...kets-10-pk.html
Triple Sulpha
http://www.bigalspet...kets-10-pk.html
Or maybe one of the Maracyn's....
http://www.drsfoster...833&pcatid=4833
http://www.drsfoster...842&pcatid=4842
http://www.drsfoster...838&pcatid=4838

That's pretty much it....
Don't really have any experience dosing any of these so as I said before, I'm pretty nervous. Also like stated before, the eye cloud is not severe, but it does seem as if its getting worse as time goes on...Otherwise honestly, I'd just live with it.

First pic is how he looks normally. Second and third is after a water change. Last pic is a few hours after the water change. After half a day, he looks as he does in the first pic again.

 

[Aquanero]

API Erythromycin or Mardel Maracyn (NOT MARACYN 2) which is also erythromycin, is the antibiotic to use here as it is an excelent choice for eye infections cloudy eye etc. One important thing to remember is Erythromycin is hard on nitrifying bacteria, especially above a PH of ~7.2 however in established aquariums the nitrifying bacteria will usually grow back pretty fast. Erythromycin is a mostly gram-positive antibiotic where as most antibiotics used for fish are either a broad spectrum or primarly gram negative. Nitrifying bacteria is also gram positive and that is why this is very hard on the BB. If this is the only fish affected a bath can be used by using a double does of erythromycin with a single dose of methylene blue in a container of tank water for 30 mins a day. Otherwise dose the main tank with the erythromycin and monitor water parameters during treatment. Once treatment is complete a large water change with some seachem stability will get the BB back where it needs to be. Don't worry about the fish erythromycin will not harm it so its safe to use with your water perameters. Discontinue the melafix and salt during treatment. Do a 50% water change and treat the tank as per package instrustions.

 

[Tango374]

Thanks Aquanero.
Any opinion on Maracyn Plus?
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4615+4629+4833&pcatid=4833

Or should I definitely stick with the standard Mardel Maracyn?

 

[Aquanero]

I would just use the erythromycin (Maracyn).