Hi all, After several years off I finally started up a small 20 gallon long mixed reef tank. The tank has cycled and I just added a pulsing Xenia. I noticed that the Xenia is open an pulsing in the early morning, right when the lights turn out. However, as the day goes on, the Xenia closes up as the lights get brighter. I have a Kessil A360W Tuna about 8" above the tank. The lights are on for 15 hours but reach max brightness between 12pm and 4pm. Could my lights be too bright for the tank? I don't know what else it could be, ammonia and nitrites are 0, nitrates are <5ppm, pH is 8.2, dKH is 7.5, and temp is 77F. Would appreciate any thoughts, thank you!!!