i have one in my 37g column tank which is 20'' deep x 20'' wide x 24'' tall. it is on the sand at the very bottom and i only use a 150w sunpod hqi. it is doing very well and it must be happy where it is at because it doesn't shoot around the tank. i add marine snow every other day, but i feed shrimp, clams, mussels, lobster, crab, nori, and squid all blended up, and all of my livestock goes crazy for it.