Am running two 96 watt PC’s (mostly dull, barely fluorescing semi actinic bulbs, and one 250 watt 6500k Iwasaki); 3″ cooling fan connected to canopy, blowing directly across the halide (super flow rate of over 500cfm easy); sump is open with plenty of circulation, refugium unfortunately is in a separate cabinet 2 feet away from tank (higher than sump so water is gravity fed back to sump). with refugium lights on 24/7 ecosystem method-miracle mud/Caulerpa, etc.. so some heat generated there with the 20 watt bulb, but cant be much. Chiller is a Teclima RA200.
