hey! im new to the hobby to im sure you have already been told this but you need live rock ALOT of it and its NOT cheap i have read and have heard that you should have 1lb of rock per gallon of water sooooo that would be 220 lbs of rock. I used crushed coral in my 55g but have been reading its not the greatest im geting a 120g and i will be using live sand. Cycle Cycle Cycle that much i do know what are you planning on putting in yout tank?