First, welcome to ReefChat! Now a few questions. Do you know your water parameters? In particular the Magnesium. Coraline algae takes up a lot a magnesium. Secon you said you recently changed out your bulbs. When you started them back up did you use a reduced time period? The new bulbs will have a higher intensity or PAR value. This could be burning the corals or "bleaching" them. You should use a reduced period when replacing the bulbs. This will give the corals time to acclimate to the light. FYI - It takes roughly 100 hours for the bulbs to be burned in. Hope this helps. |