Originally Posted by
LizStreithorst
I'm sorry Fire, but I disagree with Ipsouth. The fish you pictured is emaciated and miserable. If you decide to try to save it put it in a 10 gallon by itself and treat with Levamasol and Furan II. Someone else like Al will have to tell you if you can use both together. If a fish eats but continues to loose weight it's full of worms, that's why I suggest worming. The white patch is a secondary bacterial infection which is why it needs the Furan II.
One thing that you can to is see whether or not you need to age your WC water. This is very important and very easy. Just get a 5 gallon bucket, fill it with tap water and check the pH. Then stick an air stone in the bucket, let it bubble over night and check the pH again. Please ask your local fish store if they will test your water parameters for free. I can't afford a test kit either so when I think I might have a problem I just take a water sample to my pet store where they test it for free.
In this case a UV filter is a waste of money.