Well, I've used PC lighting for several years with great success.... growing softies and some LPS. The 260 watts over my 90 gal was sufficient lighting... until I fell in love with anemones
My tank is 24 " deep so I felt the need to get MH. I've recently purchased (waiting for them to arrive) a Hamilton canopy which includes 2 x 250 watt MH, 6500 iwaski (driven by magnetic ballast ... i'll upgrade later on) and 2 x 96 watt actinic PC. I can't wait to see the difference in coral growth (I've heard they'll grow twice as fast!!) as well as the shimmering affects the MH will create!
