| Congrats on eggs, always good to see. The best way IMO is to get some kind of screen to put over them to keep the parents out. They can still see and fan the eggs, but can't eat them. Or just let them work on it. Its pretty much guaranteed for pairs to eat their eggs many times before they get the hang of it. I like to let them practice, because the eggs hatching is just half the battle.
Gutter guard material from the hardware store works. Let them lay the eggs, and then slip the screen over them. Leave it on until they go freeswimming or you feel comfortable that they won't eat them anymore. Be sure to wait for the female and male to finish their passes over the eggs to put the screen around them. Being that yours are on the back wall it makes it a little harder to cover. Have you thought of using a breeding cone or clay flower pot?
Another note, by day 3 they should be wigglers provided the male fertilized them. If they are not white by 12-24hrs after they are laid, they are fertile. You could very well be getting them to wiggler stage but then they get eaten. Also common. | 
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Congrats on the Discus eggs! I'm sure some of our Discus keeper members will help you out shortly. Too, one member "Slug" I'm sure will see this and respond in time. He's currently over seas.
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