View Full Version : 400w MH DIY Luminarc over 18'' tank?

06/02/2009, 11:31 AM
I putting together a new tank. Its 72 x 24 x 18 and I have 2 400w and 1 250w MH ballast and the stuff to build the reflectors. I plan to run 20k Radium's. How high off the top of the water should I mount the reflector, and am I tryin to cram to much light into this shallow of a tank? I plan to keep mostly SPS.