If it's the same virus that I dealt with a few years ago by bringing imported discus into the house when I only had domestics, it will take you close to a month for it to run it's course and for the fish to actually look good again. The only saving grace is that they ate through the entire illness. They will shed huge amounts of slime every day. Mine were in my 72G tank, no illness with any of the other species of fish, it is strictly a discus virus. I passed it into my tank by using the same python from the QT tank in another room to this one. While the virus does have to run it's course, you may encounter some other issues because of the discus's weakened state. I wound up also having to treat for cloudy eyes and a couple of patches of fungus along the way. Huge water changes every day, without fail. Keep the filter clean of shedding slime. Wipe the glass down daily. Feed the discus the best food you have, I kept mine on bloodworms since the always eat those with gusto. Keep them in a subdued light environment, and watch them for secondary health issues. Do not subject them to any salt. While they are continuously shedding their slime coat, their bodies are without protection and you will burn their skin. This virus is something the new discus carry normally, they have an immunity to it, and it's very frustrating to watch the new discus eat like pigs and act totally normal while your old stock looks like death warmed over. Hang in there! It is not an easy thing to deal with. I was extremely fortunate in that I didn't lose any of my discus.
