I just changed out my Tek T5 fixture on my 75 and put Kessils on it. Absolutely love the Kessils. I have a brand new Beep Blue 35 gallon cube that I bought off of craig's list and when I set it up. I'm going to have a kessil on it. IMO there are two things on a reef setup you don't cheap out on. Protein Skimmer and Lights.