Had his same setup and loved it. No co2 so I had the light running at 35% for only a 2 hour duration then a long 4 hour ramp up and down. I would advise bringing the light as high up off the water as you can with the gooseneck. The Kessil, mostly any led really, is very high par just a few inches away then tapers off to a more linear par spread, this is more prevelant on single pendant leds. I think I had 6 or 7 inches off the water with mine, just have to get the gooseneck to bend tighter higher up. Even with co2 I wouldn't run more than 55% peak for more than 4 hours. Here's a pic of mine before I tore it down earlier this year when I moved.