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I was just wondering how long of a photoperiod
everyone uses. I myself have my timer set for 12
hours. Reading the Optimum Aquarium, I see something
about how light is available underwater because the
sun has to be a certain point above the horizon to
penetrate the water. Is this true? None of my plants
currently fold up before the lights go off. I did see
that happen to Rotala wallichii when I had some.
Also, might photoperiod have anything to do with
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