I haven't had an issues with the lights. I got lazy with water changes. I let my sandbed get very low almost to the glass from suctioning it up while doing water changes then added a lot at one time and my tank did not like that. I had 4 acros growing like crazy 2 died and 1 partially bleached as a result also monti cap and super man, reverse superman, mind trick, and a few acans all.suffered the same fate. Prior to that all coral was thriving with the trulumen pros