I personally wouldn't advise it due to the massive feeding vs. pristine water needs of juvenile discus (see
http://www.plantedtank.net/forums/ge...re-bottom.html for a VERY long discussion) but it can be done if you're willing to do massive water changes...
IMO you'll end up in a catch-22 position where you either have to prioritize your discus our your plants to the detriment of the other...
I was also originally planning on raising juvie discus in my 90gal but after some pretty heavy research decided to wait till I can afford adults. I simply don't have time for those frequent feedings or water changes.