I utilize 2x over my 75g and does great with color and good coral growth. Definately a good buy for the price but be sure to place them high above the tank at least 12" above the water surface unless you have corals that require really high par readings. I've had chalace and other hard corals start to loose their color due to the intensity of the light, so I had to place them all the way on the bottom of the tank to regain color. And always acclimate them slowly by placing your corals at the bottom then bringing them higher on the water column as they get use to the intense light. I'm currently working on getting 2x 112 Ecorays for my 125 mixed coral setup....going to be nice.