I have a 125L (72") and had it started with different PC
fixtures totaling 520W. I was able to keep my birdsnests corals doing ok with this setup because the tank is so shallow but knew that I would need better lighting in the future. In Dec. I upgraded to a 72" fixture that had 3 x175W MH
and 4 x 65W actinic blue PC
. My friends comment that my tanks looks so much better and except for an incredible algae bloom, everything looks good. I did have to adjust my heaters and my power bill went up about $20 a month. I bought it from Aquatraders.com for $400 which is much cheaper than any other place but has a reputation for not having the best quality equipment. All my lighting and replacement bulbs have come from them for the last few years and I have had no problems. Good Luck!