I brought mine down from 10 hours to 6 hours a few months back. I have seen nothing but great results. Pretty much exactly what people have been saying in that thread--better polyp extension, better color, better growth.
It makes sense too...If you go a bit further than that thread and do some reading (search on google scholar about Photoinhibition in corals) you will find its not completely clear yet but most scientists are leaning towards excessive amounts of light actually "exhausting" corals and slowing growth down.
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