Brains typically are placed on the sand. If you were to do that in your tank you'd need strong lighting to reach them as they tend to like moderate to high light. With that said I have strong light on my tank and I had to place my open brain up on the rocks so my goby wouldn't bury it. You could get away with that as well to place it closer to the lights but I'd still not go with low lighting. For that you'd want to stick with either non-photosynthetic species or low light ones such as polyps and mushrooms.
