Nice setup looks great! The corals could just be adjusting to the new Kessils. They tend to look dim but they can burn corals easily if turned up too high. Do you have them on a controller? What setting are they at currently? I would start at around 40% intensity and ramp up slowly over the next couple months. My A360 is 14" above the water and it maxes at 65% intensity. I'm thinking it could be the lights. Good luck hope you figure it out soon.

