Zoas are near bottom of tank in 100 parIf you say your light is 500 par. Look for the measurements of par from where the light is sitting to the surface of the water also measure how far the corals are from the light because 500 par is wayyyyy too high for soft and some LPS corals. That would completely fry the corals especially since you said the blues are at 80%? That’s way too much light for Zoas they like 100-200
Par range. Not 500 par. That’s crazy they would die