Well it took several months before I got them turned up, my unit sits 8" above the water, my tank is 30" deep so I believe its easier with deeper tanks, but my LEDs run now at 80% blue and 60% white, I did map out par on the tank and the coral in the highest par is the blue/green bubble at 300 par the torch at the top of the tank doesn't sit directly under the light and is around 250 par, my optics are 120, with 90 or 60 degree optics you get deeper penetration so just turn up a little at a time. I take lots of pictures to compare what corals look like on a week to week basis. At the first sign if bleaching I backed down to where I was the week before and just wait another week. Or if in pictures I show more extensions the week before then possibly the coral us trying to draw itself in due to the lights. Only you know what your coral looks like so chances are they should show signs of distress before bleaching takes a turn for worst. I should also mention I clean my lenses once a month to prevent salt creep and only run both blues and whites for 7 hours. I do 25 gallon water changes every two weeks and dose 3 times a week for calcium and alk, I did bleach a blasto but its now orange instead of red which can be common with many red LPs under leds
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