So I have a 75g mix reef system that's been up for about a year and a half. I have been running two h.o. Led strips for the duration it's been up, good health great colors. Tomorrow I will be upgrading to an odyssea 2x 150w metal halide/power compact unit (wanting to see if sps growth while increase). My question being new to MH lighting is how high above the tank should these lights sit, and what kind of reaction from corals can I expect while they acclimate to the new lighting. Currently closest corals to the top are mostly sps (roughly 4-6" from the surface) and couple of toad stools. About 3-4" below that are some zoas and a Duncan, and the rest of the coral mostly lps (frogspawn, acans, blasto) sit belo
w those between 8-10" down from the surface if not lower.