Can I Turn My Aquarium Light Off At Night When I Have Live Plants?

Asomeone

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No not at all. Plants just like us humans observe normal light cycles. Timers help maintain a constant light cycle. About 8 hours a day of light is normally adequate for most plants. For Javas and Swords this is plenty. Lights being on too long promotes algae growth. Co2 levels increase when the lights are off since the plants aren't utilizing photosynthesis. You want the time off to allow co2 to build back up in the tank for plants to use.
 
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Mackenziecromie

Mackenziecromie

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Asomeone said:
No not at all. Plants just like us humans observe normal light cycles. Timers help maintain a constant light cycle. About 8 hours a day of light is normally adequate for most plants. For Javas and Swords this is plenty. Lights being on too long promotes algae growth. Co2 levels increase when the lights are off since the plants aren't utilizing photosynthesis. You want the time off to allow co2 to build back up in the tank for plants to use.
Awesome thanks so much for the detailed reply!
 

CheshireKat

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I have two tanks with lights on at night, using my desk lamp. They don't have plants in them, so I'm not worried about that. I have one tank lit from 10pm-1am for now until I replant it. I use to have another tank on at night but after upgrading the light, it's too bright for me to have on at night, so I switched it to day.
You can have lights on at day or night provided the schedule is consistent and not on long enough to cause algae issues. You definitely don't want them on 24/7.
 

imba

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DoubleDutch said:
Why exactly ?
For context, the plants I have are low light plants mainly, anubias, Java fern, bolbitos, buce, crypts and vals. No co2, low tech tank and I find that 4 hrs gives me minimal algae issues, with decent growth for the plants. I started at 3 hrs, and work my way up to 6 hrs and eventually found 4 hrs to be the sweet spot for me
 

abbytherookiehuman

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in the wild plants experience night time, so we can assume that they need the same in captivity.
try using a timer power socket so it turns on and off at the same time every day incase you forget.
happy plant keeping
 

DoubleDutch

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imba said:
For context, the plants I have are low light plants mainly, anubias, Java fern, bolbitos, buce, crypts and vals. No co2, low tech tank and I find that 4 hrs gives me minimal algae issues, with decent growth for the plants. I started at 3 hrs, and work my way up to 6 hrs and eventually found 4 hrs to be the sweet spot for me
Ahhh okay. Only thing is low light plants aren't short light plants hahaha. They need a photosynthese period as well. But as always : If it works for you that's great !
 

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