Do plants need night?
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Old 08-10-2003, 03:08 AM   #1
Deuce868
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I am getting my new 70gal running and put in my first load of plants today and had a thought...do I need to cut the lights at night? If I leave them on 24/7 would I get them to set in sooner or do the plants use night as some sort of resting period.

Anyone have any insights on this one?
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Old 08-10-2003, 03:17 AM   #2
2la
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Leaving the lights on is sure-fire recipe for algae problems and a slow death sentence for animals if present. Plants need a regular day/night cycle just like animals.
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Old 08-10-2003, 05:07 AM   #3
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ok, just a thought. =)
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Old 08-10-2003, 06:35 AM   #4
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I have wondered how much it is necessary for plants to have darkness after a day of photosynthesis. I'm no botonist but I do remember something about the light and dark reaction in the plant growing cycle from school. When I come home late at night from work I have the urge to turn the lights on for awhile to look at my tank but I really have no idea if this is harming them in any way.
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Old 08-10-2003, 08:17 AM   #5
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You could shift the photoperiod say 6 hours... turn on the lights at noon and turn them off at midnight. Unless there is a lot of "natural" daylight hitting the tank.
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Old 08-11-2003, 01:26 AM   #6
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can i turn my lights on for 2 hours in the morning when im getting ready for school and have my tiner turn it off and have the timer on for another 10 hours at night? like to 12 PM. that way my tank won't be dark when i am doing homework.
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Old 08-11-2003, 03:07 AM   #7
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No, keep the photoperiod continuous. Breaking it up just invites algae.
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Old 08-11-2003, 03:11 AM   #8
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I wouldn't. And I don't have any particular reason saying that... many plants are photoperiodically sensitive, and if you turn on the lights a little in the morning and then off it might lead them to think they are in "Long day" period and they might behave strange, like stop growing leaves and start to flower instead. Just a theory though, I am sure someone out there has tried and trued it and will have totally different experiences. :mrgreen:
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Old 08-11-2003, 09:43 AM   #9
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24/7 light for days or weeks will cause rapid growth and then the plant will burn itself out. A few years ago when I went on a 3 week vacation, the person taking care of my tank left the light on for the entire time I was gone. My three inch tall Aponogetons grew to three feet and then died a week after I got back.

In light plants give off oxygen and at night give off C02. They need the dark as much as the light.
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