How long should the lights be on?

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PaulVerrall
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How long should the lights be on?

Post by PaulVerrall »

Another contentious question that I've had many answers to.

My tank is out of sunlight, has no live plants in it and I have the white light or can switch to blue.

Currently cycling with no fish, how long should the light be on whilst cycling. And then how long once the tank is stocked please?

At the moment it's on for 3 hours in the morning and off through the day then on about 5 hours in the evening

Thanks

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Re: How long should the lights be on?

Post by mikeyw64 »

AFAIK then if you have no live planting then you can have the lights on as and when you like. The fish don't care :)

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Re: How long should the lights be on?

Post by fr499y »

lights wont come into play with cycling, unless you have live plants. Whilst cycling you can leave them off if you want.

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Re: How long should the lights be on?

Post by PaulVerrall »

mikeyw64 wrote:
Tue Jan 21, 2020 9:31 am
AFAIK then if you have no live planting then you can have the lights on as and when you like. The fish don't care :)
Oh ok cool, I've read so many things about the fish need some darkness and also algae growth with the light on too much.

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Re: How long should the lights be on?

Post by mikeyw64 »

algae would be your biggest problem potentially

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Re: How long should the lights be on?

Post by ThePizzaMan »

Pretty sure fish, regardless of their diurnal or nocturnal activities, should be kept longterm with a regular lights on/off schedule. Their brains need periods of inactivity (ie; sleeping) too and their circadian rhythms (just like us) help regulate that.

This would suggest that leaving the tank lit up or darkened indefinitely would have an impact, perhaps not on short term scales, but on the longevity of your fishes' lives.

I'm not an expert on sleep in fish, but I am pretty well studied on sleep in hominids - essentially anything with a brain will need some sort of sleep-like function.

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Re: How long should the lights be on?

Post by Stephen »

I would suggest keeping the lights on (to view the fish) for about 6-8 hours a day (when you're home).
Use a digital timer to set the on/off so that it is a regular light period.
Anything longer may cause an algae issue.
fr499y wrote:
Tue Jan 21, 2020 9:44 am
Whilst cycling you can leave them off if you want.
I agree, why waste electric.
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Re: How long should the lights be on?

Post by PaulVerrall »

Cool cheers, I'll get a timer plug and set the light to come on the same time everyday

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