Erm, the eggs are probably molding over because they didn't get fertilized BTW.
To the best of my knowledge there are no waters within the continental U.S. with a low enough gH for discus to successfully breed without the use of an R.O./D.I. system.
Also, females will lay eggs - and discus will pair off - almost a full 1-2 years before the male is mature enough to fertilize eggs.
It can take up to 5 tries for a fully matured pair to actually get it right.
There's a wealth of knowledge at Simply Discus, if you want to get serious about spawning them I would highly suggest heading over there and investing a few hours in reading through their forums.
EDIT:
To give you a bit of background - and keep in mind I have no idea what experience you have with discus, so if this is repetitive don't think I'm trying to lecture you or something - discus normally only spawn during the rain reason. Rain is pretty much 0 gH, literally pure water with very little mineral content. If you want to trigger spawning (and what likely did in the first place - but who knows) you simply perform a large water change (50%+) with water that is about 4 degree's cooler then what's in the tank.
If the water is also R.O./D.I. water, it will encourage pairing behaviors. You'll want to watch those two discus - as the females become pissy with the males after a few unsuccessful spawns and will start to beat on them a lot.
