I agree with that 100%, happened to me when i changed my lights... it was still there but much much lighter in color...Chew, I've read that a lot in the past too. Tanks with tons of light usually have a lighter purple coralline from what I've seen, but that could be from so many other factors. But I have read many times about coralline not doing as well in higher PAR.
btw rich other than the redbug's how all the corals doing?