I know it's not generally accepted to keep Discus single but after some research and feedback from various sources I decided to take the plunge.
The tank is 33 Gallon, 20" tall. pH 6.5, KH 3, GH 6, NO3 15ppm (dosed), PO4 1ppm (dosed), CO2 30ppm. 50% weekly water change RO/CBR filtered tap 50:50 mix.
Fish - 4 inch juvenile Red Marlboro Discus, 28 Cardinal tetra, 4 Otos, 8 Amano shrimp.
Plants - Microsorium pteropus on bogwood, Sagittaria platyphylla, Crinum calistratium.
Lighting - 2 WPG HO T8 (4 x 18W)
Substrate - Dennerle Deponit, black quartz, 25W heater cable.
Ferts - KNO3, KH2PO4, Dennerle range (S7, E15, V30)
CO2 - 2 x Nutrafin (soon to be pressurized).
Long-term plans include pH controller for pressurized CO2. T5 lighting and changing foreground planting to Hemianthus callitrichoides.