Hi Carmen,
The swollen/cloudy eye is caused by either eye flukes, cryptokarion or bacteria.
Since you said "fluffy" patches I would lean toward recommending
http://www.seachem.com/products/prod...ParaGuard.html
from Seachem. Perhaps Red Coral has it in stock?
I would recommend 10% water change a day from the display tank to keep ammonia low in the QT. You cant use an ammonia neutralizer as it will counteract the medication. Make sure that you add medication to the water removed from the display tank before you add it to the QT. Do siphon out any uneaten food.
You were wise to use the QT tank. You may be saving all your fish in the display tank.
Hopefully the angel pulls through.