Corals becoming pastel color?

[asylumdown]

My corals are pretty pastel from having low nutrients in the water. undetectable nitrates and 0.02 phosphate is pretty low. Is there any algae of any kind growing in your tank? If you've got super clean looking rocks and no macro algae of any kind, or if the growth rate of your algaes has declined significantly recently, it's a good chance the issue is nutrients.