Welcome To The World Of The Hex Tank !! I Have One Half The Size Of The One You Have. I Just Ordered The 150w 14k Mh From Hamilton. Everyone Helped Me Make Up My Mind Here. You Might Want To Hang It Over Your Tank And Keep The Top Open. Also Have Fun Aquiscaping.. What A Pain In The But It Was For Me. But Your Tank Is Double The Size Of Mine So You Might Have Better Luck !!!
Good Luck And Take Your Time With It !!!! Welcome To Livingreefs.com