So for lighting you're gonna do 175ws? What are you planning on keeping in the tank, what bulbs are you planning on using, and what reflectors? I only ask because I've got 2x250w in Luminarc minis over my 120, and a lot of times I'm feeling that I'm not getting enough light into the tank... :/ ... You can do 175w, but it all depends what bulbs, reflectors, and corals you plan on keeping. The overflow is looking great so far, and I can't wait to see where this goes!