I have a Green Element EVO Quad 48"light. 216 watts. LED. I am having trouble with my frags closing and not opening up while other older corals seem to be fine. All water parameters are correct. My LFS double checked water and found nothing wrong also. Suggested that maybe to strong of lighting. I said all that to ask if anyone knows of away ,dimmer, to dim the lights on this fixture. I haven't been able to find a dimmer for it. Thanks for your help.