Lighting Question -length and interrupted lighting

Hi
I was reading somewhere that to help fight algae you can turn your lights
off 2-3 hours in the middle of the day. Has anybody done this? Any
experiences good or bad? Also regarding length, I read anywhere from 10hrs
to 15hrs a day for a tank. My tank is low light(just under 2 watts/gallon)
and was wondering is there anything that would help me decide the number of
hours I should have it on.
Thanks

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JHudson
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