I have successfully kept my Bi-mac in a one hundred and fifty gallon reef. It has 3 - 250 watt metal halides and 2 -6' actinic VHO bulbs. My tank does have a glass canopy which provides some light diffusion. My octo seems adjusted to light and temp conditions which hover around 76-78 F. The reef is stocked with Xenia, small variety of Mont-Digi. Leather,Candy,Trumpet, and Brain corals. Some Gorgonions, various plate corals and mushroom anemones. The fish include a Yellow, Scopas and Kole Tang. One Rabbitfish, Lawnmower blenny,Orchid Dottyback and various damsels. I have the larger species of Bi-mac. I quickly trained mine to eat from hand,Shrimp and Silversides. This was accomplished within 2-days of introduction into the tank. My octo still munches on snails and hermit crabs but doesn't descimate them as soon as they are introduced due to the regular feeding schedule provided.