I think a little more light is better because of tank height unless of course the focus is the fish. In which case, the plants will be fine. The usual problem with discus is temperature, high organic discharge/filtration/WC. You'll be fine if you can keep those under control. I also recommend you to keep white sand fg-foreground. In this case your scape would be focussed on barricading the white sand with smaller stones/wood to prevent the soil from messing up the front.
Some floating plants are good nitrate suckers if you have good filtration.
Keeping wild Discus?
You can if you dare to fail - Stan Chung
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