Ok, I agree with that kinda of output in the air at a couple inches. When I did my testing on my tank I did that then I started at 6 or 7" below the surface where it had dropped off from around 1100 to about 700, so it does attenuate quite a bit when you bring water and depth into play.
yes, VHO, PC, even NO will bleach a coral if it is not acclimated properly, I am assuming that the acclimation is proper and we are not dealing with that.
Steve
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