I run one on my 120gal...You can click the red house at the top of this post for details on my tank. But I am really really pleased with it. I am glad I went for it instead of a sea swirl. The only thing I think I could have been just as happy with would have been an oceanmotion. Granted it is compleatly diffrent, but I think that is the only other method that would have given me the wave results I was looking for. All in all I am very pleased.
I do have one large complaint though. Based on how you secure it to the tank I could not put it on the back of the tank. The glass is too thick, and it would not fit. So I had to attach it to the center brace. Seems like they should have been able to get around this problem, but oh well.