Just installed a new fixture over my frag tank and would love to borrow the PAR meter so I can figure out what height to adjust it too. Also love to take opinions on this in the meantime. Its a 25 gallon frag tank. 16" deep. The fixture is a 4 bulb ATI T5's with two Reef Brite XHO LEDS on either dise. How high should I adjust it over the top of the water for now so I don't shock the corals. It's replacing a 2 bulb T5 reef bright hybrid with a single XHO. The Reef Brite fixture was 8" off the water.