WOW this is a 7 year old tread..... just shows you how this hobby have moved..... it seems as back in the days 12 hours is a norm.... now-a-days it's more like 8 hours..... personally I running a 48" 6 bulb fixture 8 hours for two bulbs and 4 hours for the other 4 bulbs. I've only switched to this photo period about 4 weeks ago and I've noticed color improvements in my SPS.....
Hey man! Howz the tank doing these day after the bad turn you had a while ago? Will be looking for your tank thread to see, still one of my favourite tanks