The brain (depending on species) will for the most part prefer being on the soft sandy substrate. They do not do well on hard surfaces or where the edges of the scleractinia may get damaged or "bruised" by being up against rock.
The light should also be fine for the brain and even though most zoo's can never seem to get enough light, I would start the coral out on the substrate and guage it's health as time passes. If the zoo's do not fluorish lower in the tank, you can make special arrangements to place it higher with epoxy or super glue gel.
Any chance of posting a pic? That combo sounds cool..