Thanks for replies, I have the Nova extreme also, not much for corals yet, 8 months old...I have tried but they don't do to well. I am still dealing with a diatom issue and was wondering if maybe its the lights nearing the end of their lifespan. And yes...they are current brand. I run 10 hrs a day with Atenics on 12 hrs and moon lights all night.
They all look as bright as day one, I just can't get rid of the brown covering on my glass and equip. I do a 20% water change...wipe it all down...7-10 days its back. I can't clean the back glass very well so it builds up pretty good.
Just exploring a different area, as I was told the lights can cause algae issues also. I have gone the water chemistry route and after several months / paychecks I feel the chemistry is not the issue anymore...all parameters are great to perfect.