A big issue many reef hobbyists encounter when using new LED aquarium lights is coral bleaching and proper light acclimation.
Acclimating your Corals to LED Lights Coral bleaching is when a coral loses its symbiotic zooxanthellae (what gives them color). When corals are "stressed," they often expel their zooxanthellae, leading to a lighter or completely white appearance (hence, why we call it "bleaching"). In nature, it can be caused by a multitude of factors, including: