I have a 100g hex. I have cfl lights, 1 dual tube 55w 10000k and 1 dual tube actinic 55w. I have (soft) corals and they are doing well. I have, so far, 1 Hammer with 5 heads, 5 zenia frags that are growing like mad and several tree corals. The tank is 3 ft tall and 25" on each side.