I have a custom hood with 2 X 36 watt PC's over it. One 10,000K and One 7100K Actinic Blue. It also has a custom refugium 12 X 18 inches that houses the CPR BakPak 2 Skimmer and the heater. That's about it as far as equipment. As far as critters it has a dozen nassarius snails, a few astrea, a hermit, one emarald crab, and a Yellow Watchman Goby.