Stripped all po4 from tank!

[olecaptainj]

Thanks trigger. At least I know what I’m dealing with here and it isn’t a secondary issue.

Guess I’ll just have to wait it out.

 

[rkpetersen]

Those corals look mildly bleached, but also like they can still recover. In addition to what you've done already, you might consider reducing the illumination a bit (if it was adequate to begin with, and if other unaffected corals don't object.)