I would think you could get away with only some shrooms, not much more. I've got a 38 tall with 70 watts of RO lights and thats all I can support right now. Although, the owner of the LFS i deal with told me that I could get a bubble coral under my lights? He said they require low lights and would do fine in mine if placed somewhere closer to the top of the tank...anyone have an opinion on this? Please answer the original posters question before mine, thanks