Its hard to say with SPS, so many factors going into keeping them happy and healthy over a long period of time.
Your Radion program seems rather linear with a large negative slope, I would try swapping it over to a more parabolic arch centering around noon and decreasing intensity all the way through out. I have never had a Radion over 75% intensity for fear of bleaching and I have always kept them 12-14" off the water. Now that I look at it your running the light for way too long with some major intensity, 9-12 is 15 hours with a lowest setting of 43%!! Way too much light IMO. Do you have any photos of the SPS in question?
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