I am using two 250 watt 12000k bulbs on a 75 gallon tank. I have 5 species of acropora, 2 montipora, stariatapora (cats paw), merulina, and pocilopora. (Please excuse the spelling in the species names). I only have one clam, a T. Maximma. All seem to be doing well. I like the 12000k,s because...