well, thank you very much for alll the help guys.and yes they are going to be adult discus.i currently breed them and figured that i needed a show tank in my house so this is going to be it.
One big difference I have found with keeping Discus in a planted tank is their reaction to low O2 levels. Being a bigger fish, they can develop problems quickly if O2 levels drop. Since turbulence can outgas CO2, it is sometimes said a planted tank is better suited with low flow/low turbulence. Doing that makes it quite possible to attain low O2 levels in the tank. I have experienced problems with low O2 levels and actually killed Discus because it was not possible to raise the O2 levels quick enough to save them. Keep this in mind throughout your design stage; surely you already know the water & TDS requirements for Discus. A 125 gallon planted tank that has nano fish might have more O2 available than a 125 with 8-10 adult Discus.
Two sites I would recommend is Rex's and Chuck's. Rex's link has already been provided, here is Chuck's:
Chuck's Planted Aquaria Pages
The forums here contain outstanding information on equipping and setting up a planted tank. I would recommend before buying any equipment taking a weekend and searching them to identify what will work for you. I have links to what works for me below but that may not be what you are looking for so look around.
I have found Sterbai Corydoras handle the heat very well, I have over a dozen in a 110. Bristlenose, whiptail cats, farlowella, and golden nuggets also handle the heat well and are excellent janitors. I stocked 40 fish in a 110, 10 wild Discus and the rest were the janitors listed above. You want to ensure the uneaten food disappears, it has more hiding spots in a planted tank and can be missed by the Discus when they graze and butt each other around.
I have found a lot of plants do well in the 85F I keep my Discus tank at. If you decide on a high tech tank, let me know when you are ready and I will RAOK you some plants to get started......DC