I have them approx 15 in above the waterline. I run them at 35 blue 1 white. I get approx 200 PAR midway down.Nice to hear someone else has a similar set up, yea I figured I would to does the tank when it gets packed with corals, what percentage are you running. And do you have any other tips you’ve learned dealing with this set up, how high is your lights from the water and what’s your running time?