Water:
What are your Prams?
Are you using RODI or Tap water. (Need to use RODI)
If using RODI, Are you making yourself or buying? ( If Buying test it)(Get your own unit)
Lights:
Are lights on a timer?
Main lights should be on for no more then 8 hours.
Cut lights back to 4 hours a day for two weeks.
Then bring up to 6 hours for a week then back to 8
Window:
Is there a window near the tank where it is getting any direct sunlight?
Direct sunlight will cause these issues. Get a shade, blinds or Curtain.
Are you running a Skimmer?
If so, Skim wetter. If not, buy one
Are you using a sump? does it have any Cheato?