upgrading MH lighting unit for SPS

[sontdo]

I'm planning to upgrade my lighting to keep SPS alive. Currently I have MH Ballast PFO 175 W X 2 with 6 VHO Actinic blue in a 100G tank, 48X24X20, with a canopy. Space is limited under the canopy. What is the best solution for optimal lighting upgrade to 250W X2 or 400W X2 MH and which ballast? Should I increase to 400W X2 or mixed of 250W and 400W. Thanks for any recommendation. I'd like to keep the set up simple due to limited space.

[andy]

IMO, 250W MHs should be fine. 400W bulbs will get pretty hot come summertime. Also, keep in mind that (for the most part) flow >> lighting. You'd do better with 250W and crazy water motion than 400W and low flow.

[sontdo]

thanks Andy. I'll get two 250 W and do two MJ 1200 with mods.