Chad,
I have two open brains that sit directly on the sandbed under 90W of NO lighting. From what I have read, brains wether open or closed prefer med flow and medium light.
As Tony mentioned, they do like to be fed on occasion. I feed mine a small chunk of frozen brine once every two weeks. Both my clowns use these corals as surrogate host, so they are also fed by other means too.
On another note, from my diving and snorkeling experience over the years in Playa del Carmen-Mexico, I have always seen the brain corals at around 10-25 feet in calmer areas of the reefs.
Here's a recent image of my green open brain
