I Have been out of reefing for about 10 years. I had a 125 Gal long and built my own LED hood with cree leds. Now I see that I can just purchase LED lights. The new tank is an Octo lux t90. 35" long 18" wide and 18" deep. My plan (at this moment) is to do a floating reef(shelf to hold rock about 5" off the bottom) and to start with 3 AI Prime hd lights. I am most likely going to need more as I want to keep SPS. I have no experience with the AI Prime HD lights and am hoping someone who is using multiple units might chime in with advice. Thanks for the help.