I had mine at a lower level in a 55 with 4x55w and it was doing great. At 4x55 it seemed to make very long stalks (and grow like crazy).
At 4x55 + 2x96, its stalks have shortened quite a bit, and it grows even faster.
So you should be fine.
55g reef, 2x250W 10k MH
+ 2x96W PC
actninc, 10g sump, AquaC Urchin skimmer, 65lbs LR
xenia, mushrooms, wels. open brain, fungia radiata (orange), green eyed zoos
flame angel, mated pair of false perc, 6-line, firefish
20gH electric yellow cichlid