I would keep it at least 8" off the water surface, but that is only my opinion. Probably a good enuf light to keep some LPS, and maybe some of the hardier sps like the montipora digitata and such. For acros, I don't know if this is gonna cut it, unless you place them fairly high in the tank. I wouldn't try clams unless you get something with a little higher intensity. How long has your system been set up?
As far as times go, I would start the actinics an hour or so before the halides come on, and an hour or so after they go off. I usually run my halides 8 hours. HTH



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