No problem with the replies - it's what the forums are here for! Just hope it will help a bit...
Where are you from? Is there anyone you know that you could borrow a hospital set up from?
Okies...Those cascade filters are good (I've got one

) Did you leave the charcoal filter cartridge in?? If you did, and you're not using meds, it's a bit of a waste of the carbon

you could always put some other filter media in there instead...
What are you feeding your fish on? If it's just flake, this can lead to problems (as I only found out myself recently

) Try some shelled peas (Frozen peas cooked for a few minutes, shells removed and crush the inside...let it cool and drop 'em in...) or some frozen bloodworm...
As for poor Mr. Floaty, try and get some Melafix in there, regular water changes...but most of all, get your water checked! Your LFS should be able to do this for you if you take them a sample, but a comprehensive test kit is a worthy investment...I use a Freshwater Pharmaceuticals Master Test Kit - seems to do the job ok
How big is your tank btw?
F&I B)