Mine likes medium to low currents. I'm still waiting for my canopy to be made right now, so my lights are pretty low, and I too have mine on top. Once I have my lights, I'll move it down more. I would reserve the top portion of your tank for corals that requires more lights like LPS corals (if you are going that route). I don't spot feed mine and feed my corals phytoplankton about 3 times a week. They'll get their food from the light. Hardy coral.