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#1
10-08-2010, 10:09 PM
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For photoperiod, I switched down to 6 hours of MH per day, and have better colors than I did with 10 hours. I didn't have any tissue problems with 10, but colors weren't great.
My temps were always all over the place, never an issue either, so I wouldn't worry about temp at all. Your issues over the summer likely weren't a direct result of lighting, but reducing full intensity can have benefits, such as reducing photoinhibition. I also keep my T5 actinic on all day, mostly for color. I could turn it off, just don't have any extra pins for my timer 
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Brad 
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#2
10-09-2010, 02:01 PM
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I wasn't able to finish my post properly yesterday so...
I'm not saying that I know what went wrong with your corals, but I don't think that lighting was the problem either. There was an article in Advanced Aquarist that demonstrated how the lighting from a 250W bulb only produced about 60% of the PAR as the sun: http://www.advancedaquarist.com/2009/7/aafeature2 Ron Shimek did a study that showed how some corals do best at trapping foods at a water velocity of 15cm/sec. How many of us measure actual water velocity? There are many factors that we do not measure that could be resulting in the demise of our corals. Mitch
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