White slime

I was wondering if you can help me out with my fish

I have 3x 2" red melons in my tank they have been unwell for 1½ weeks now. At fish there were just depressed and didn't eat, sat at bottom. The last few days they have developed a white film (mucus like) all over the body and fins. The slime coagulates and kind of peels off but doesn't. I don't think this is fungus. They are not very hungry..... :?

I have completed a course of metronidazole and praziquantel....doesn't seem to have helped.

I've checked the water parameters and temperature and there isn't a problem there.

Any clues?

Sounds to me like velvet disease :?.

http://freshaquarium.about.com/cs/disease/p/velvet.htm
http://www.aquaculture.bz/fish-disea...t-Disease.html

I like the copper sulphate treatment for velvet.. but others may disagree.

So anyway will trisulfa tablets work? i have that in stock at the moment. don't know where to get the copper sulphate.

the multicure also says it covers velvet?

i don't seem to see 'gold/brown' lesions and the slime is definitely 'single' and not confluent of individual lesions....

really driving me crazy...almost two weeks...

I've been treating them as per velvet and things seem to be improving. Thanks for advice. Will keep up to date....