So I wanted LEDs for my tank because I like the shimmer effect. So I did some searching and found a 10w LED 12v flood light on ebay. I put two of them on my 125 and it is just about perfect with a slight dark spot in the center of the tank. I may add one more but I doubt it. I think the two 10s is just about perfect and looks great. This video does not do the tank justice now!
http://www.youtube.com/watch?v=ez5e4PGDO_0&feature=youtu.be
http://www.youtube.com/watch?v=ez5e4PGDO_0&feature=youtu.be