I have a 155 Gal tank that I started about 7 months ago. I use a sump (24 gal), a lot of live rock & sand, 48 inch tall protein skimmer, Metal Halides (3-250 watt, 10,000K) and Actinics (2-140 watt). The tank contains many fish and both soft & hard corals which are all happy and doing well. All...