Jeremy,
I have a 50 gal mixed softies, LPS, SPS 36" x 15" x 20" with bult in filter. If I go with xho's how many would I need. I have a standard RB 50/50 know along with a current sundial 4x 39w with a 3 to 1 mix, and was looking add 2 more RB's (1) 50/50 & (1) Blue and add an all white possibly down the road. I don't want it to blue so for know I have a 36 corallife T5 for additional white.