I want to try to have a mostley softie tank and I'm having lighting ulsers. The tank is 18 inches deep, and I want to go with MH. I like the blue look of 20k but I think I'm going to go with two 14k hamilton reef pendants. My question is what wattage, I want to go with 250w but I don't want to bleach anything, also what are some other good HQI bulbs that have a good blue color to them?