Low light corals

[Biotech]

2yr+ (approaching 3yr) tank - initially a FOWLR but slowly changing it to a LPS and softies in the last 15mths.
125 gal AGA (6' long X 18" deep)
Lighting: a 250W XM-1000K MH in the center and one 72" URI-VHO-super actinic in the front and two 96W 1000K PC lights in the back of the canopy.
I put most of the corals in the middle of the tank, and they are all doing great. Now I am thinking of filling up the two ends of the tank with some lower-light demanding corals.
I guess I can use two MH lights, but do not really want to (just personal preference - no particular logic behind it :-)))
Would like to hear your thoughts on what are the corals to put there.