My tank is a 120 4x2x2 with 2 - 75 watt MH se, 2- F size artic 3', 2-T5 artic 4', 2- T5 ultra Daylight 4' asortment of blue neons all on timers for lighting. I have a 30 gallon sump including 10 gallon isolated refugim with an assortment of algaes and plants, a 220 skimmer, a 1/3 hp chiller, and 2 - heaters with external temp probs. 3" DSB, about 150 pounds of live rock, a variety of hard and soft corals, and 20 community fish, crustaions, and snails. My tank has been running for about 2 years.