I've read this entire thread and there's some really great info on here. I've got 3 Hydra 52s over my 265g mixed reef. I had one problem with the director which AI fixed remotely (that was cool). I've been playing around with intensity settings, ramp times, length of time at peak power...etc. all my corals are doing fine, but I am having an outbreak of cyano/brown sandbed, which wasn't a problem before cutting over to these lights. S after reading this thread, I am reducing the Red and Green to 15% and only running them for about 5 hours. I dropped white to 45% from 55% I will post entire scheme tomorrow, but real curious if anyone's seen brown sand bed syndrome or cyano outbreak since putting AI Hydra or Hydra 52s? I have AI Soln Blues over my 125g for over a year and the coral growth is phenomenal. I've had the 52s on the 265g since the end of Dec. and hoping for same success.