I just read this recently as well and mentioned it to another group I am on.
Apparently, plants can begin photosynthesis as soon as there is light to do
so, but algae needs an extended period of light to get going. Shutting off
the lights will stop both the plants and the algae from photosynthesizing
but the plants start right back up again, where the algae takes a while to
get going again.

I have been doing it with my 2 tanks, but they haven't been set up long
enough to give a real opinion on it either way yet. I have just started to
"go green" but none of my tanks (planted and not) have much algae build up
to begin with.

--
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"JHudson" wrote in message
news:uu6Cb.51547$d35.7988@edtnps84...
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

--
JHudson
Sure. Fine. Whatever. -Syzygy
I have. I did. It's done. -Fight the Future
Duct tape is like the Force, it has a dark side and a light side and it
holds the universe together.
I'm completely normal, just the rest of the world is nuts...
There are lies, damn lies and statistics!