Duration questions

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kaylornix
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Joined: Thu Oct 10, 2024 7:19 pm

Duration questions

Post by kaylornix »

How long should I leave my lights on for a planted tank with Anubias and Java Fern? I've heard conflicting advice, some say 6 hours, others say 10. My tank is a 20-gallon with a Nicrew light, and I'm dosing Easy Green once a week.
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nexusa
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Joined: Thu Oct 10, 2024 4:36 am

Re: Duration questions

Post by nexusa »

It depends on your light intensity and plant needs. For low-light plants like Anubias and Java Fern, 6-8 hours is usually enough. Too much light can cause algae. What's your nitrate level? That can affect growth too.
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bayside
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Re: Duration questions

Post by bayside »

I run mine for 8 hours, split into two 4-hour periods with a break in between. Seems to keep the algae down and the plants happy. My Anubias are thriving in a 30-gallon with a Finnex light. Maybe try tweaking your schedule?
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zeni9x
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Joined: Thu Oct 17, 2024 11:36 am

Re: Duration questions

Post by zeni9x »

I've had success with 7 hours. My Java Fern started melting when I did 10, so I cut it back. Maybe start with 6 and increase if they're not growing?
raysun
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Joined: Thu Oct 10, 2024 2:02 pm

Re: Duration questions

Post by raysun »

Yo, I do 7 hours straight, no breaks. My Anubias are chill, no algae issues. Tank's a 15-gallon with a cheap LED. If your plants look good, don't mess with it too much.
kaylornix
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Joined: Thu Oct 10, 2024 7:19 pm

Re: Duration questions

Post by kaylornix »

Thanks for the advice, everyone. I'll try 7 hours and monitor the plants. My nitrates are around 20 ppm, so that should be fine.
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mintix
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Joined: Wed Oct 09, 2024 9:22 pm

Re: Duration questions

Post by mintix »

I disagree with the split lighting idea. Plants need consistent light to photosynthesize properly. Stick to a single block of 6-8 hours.
duojanae
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Joined: Thu Oct 10, 2024 10:05 pm

Re: Duration questions

Post by duojanae »

raysun wrote: Fri Jun 06, 2025 8:11 am Yo, I do 7 hours straight, no breaks. My Anubias are chill, no algae issues. Tank's a 15-gallon with a cheap LED. If your plants look good, don't mess with it too much.
Same here, but I do 6 hours. Less light means less chance of algae, and my plants are still growing slow but steady.
Ryegrain
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Joined: Thu Oct 10, 2024 8:30 pm

Re: Duration questions

Post by Ryegrain »

My tank's a mess, but the plants are alive. I leave the light on whenever I remember, lol. Probably not the best advice, but it works for me.
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nexusa
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Joined: Thu Oct 10, 2024 4:36 am

Re: Duration questions

Post by nexusa »

kaylornix wrote: Fri Jun 06, 2025 8:47 am Thanks for the advice, everyone. I'll try 7 hours and monitor the plants. My nitrates are around 20 ppm, so that should be fine.
Let us know how it goes. Adjusting light duration is trial and error sometimes.
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