Thanks to everyone for the info and for the nice welcome to Reef Frontiers.
Here is my set up: 72 gal bowfront with 4-5" DSB and about 120 lbs of LR. No mechanical filtration, but do use a skimmer. Tank is 10 months old. Have had steady parameters for over 8 months. No Ammonia, Nitrite or Nitrates. Got rid of Phosphates when I got an RO/DI unit. SG is maintained at 1.025, temp 78.8-79.8. Calcium is normally 400-420 and PH is 8.2-8.3, Alk solidly in normal range.
This started out as a FOWLR, but I soon realized I was heading for a full reef system. Currently have zoo's, palys, mushrooms, and xenias. (Also a BTA that is hosting a Percula Clown-had to have becasue of 10 year old granddaughter). Plan to add (slowly of course), both LPS and SPS once tank is acclimated to the new lights.
What height over the tank would you recommend I hang them? Also, what types of "conflicts" might I have with my current stocking as I add new corals.