YIKES!
What a mess.
Where do you live? Yes, it's important. I can think of 3 major candidates for your problem, but your geographic location would have a big impact on the increased likelyhood of any of them.
In any case, this is not going to end well.
You can try a battery of treatments with CLOUT, metronidazole, salt, Maracyn, maracyn-2, and Maroxy, but if your fish are actually infected with any of the especially nasty viruses I suspect, then these won't help.
Treat these fish, and the entire tank contents including the water, as very hazardous waste. Do NOT let this stuff get exposed to your local environment. Bag up the fish, bag up the gravel, put the water into containers, and throw it all into the trash. If you have one of these viruses NOT native to your area which came in on something from elsewhere, then the very LAST thing you want to do is let your local area get infected.
Sterilize your tank and equipment with bleach and then let it sit dry and empty for a week or two before setting it back up again.
You can try to save your fish if you insist, but don't expect good results. Assume the worst and hope for the best. Sorry about this, but the good news is that at least this sort of thing is thankfully very rare. If you successfully cure your fish using the treatments I mentioned, then that's great. If you don't, though, then you have a real mess on your hands. Viral diseases in fish aren't commonly encountered in the aquarium hobby, but when they do appear they're virtually unstoppable. If your fish are suffering from anything else, then the other treatments should work.
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