I built this same light for a 75 gallon, (18 bridglux on a 4 foot rail, times 4) 6 months ago. No fans needed. I used 60 degree optics around the outside and 90 for the rest. It sits an inch off the water, with some dico balling. I have the intensity at 100%. It is bright, and all inhabitants seem to be fine. I used a six bulb t5ho before.
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