If I remember right...I set the tank up last may, put the t5's on in april and ran it for about 3 months or so then I got the AI led system. Most if not all of my growth is from the leds. I didn't have much sps before I put the new light on the tank, and what I did have didn't show much growth at all under the t5's. This is a video from may26 and the tank was still empty. http://www.youtube.com/watch?v=OoMN5GeM_ZQ This is a video from sep14, most of the coral in this video is still small frags. Hopefully in another 6 months My tank will start looking full. http://www.youtube.com/watch?v=m7RWP1cB5bM