Another lighting debate

[that Reef Guy]

STN and RTN are usually a bacterial infection. Vibro. it should have wiped out the corals by now. algae and cyano will grow pretty immediately on the dead or dying spots. IME
Corals can STN after a quick swing or when it finally gives up the ghost after enduring longner term probs.
Personally I think we can rule out the lighting and bump up the other thread and let this one die.

Would Chemi-Clean Stop RTNing then since it is a Bacteria Infection?

Chemi-Clean Kills Bacteria.