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minimum photoperiod length for corals?


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I use my corals to adjust my photoperiod. This is what I typically do and am doing now since I just upgraded to 400 watt mh from 175 watt mh. I started at 4 hours and will be working my way up 30 min per week untill I see my acros start to lighten, at that point (when the corals start to lighten) I back off about 30 min and watch it for another week.

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