Ammonia levels in Betta tanks

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brookhun
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Joined: Thu Oct 10, 2024 8:56 pm

Ammonia levels in Betta tanks

Post by brookhun »

My betta tank's ammonia levels keep spiking, even with regular water changes. I'm using a 5-gallon tank with a sponge filter, and I feed him twice a day. What am I missing?
florapex
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Joined: Thu Oct 10, 2024 4:34 pm

Re: Ammonia levels in Betta tanks

Post by florapex »

How often are you doing water changes? In a 5-gallon, you might need to do them more frequently, like 20% every 3 days. Also, check if you're overfeeding, that's a common cause.
miguel
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Joined: Thu Oct 10, 2024 2:01 pm

Re: Ammonia levels in Betta tanks

Post by miguel »

brookhun wrote: Thu Jun 05, 2025 7:19 am My betta tank's ammonia levels keep spiking, even with regular water changes. I'm using a 5-gallon tank with a sponge filter, and I feed him twice a day. What am I missing?
Have you tested your tap water? Sometimes the source has ammonia. Also, make sure your filter media isn't too clean, you need some beneficial bacteria to break it down.
brooklane
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Joined: Thu Oct 10, 2024 6:43 pm

Re: Ammonia levels in Betta tanks

Post by brooklane »

I had the same issue until I switched to a better water conditioner. Some don't neutralize ammonia well. What brand are you using?
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bronzo
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Joined: Thu Oct 10, 2024 2:13 am

Re: Ammonia levels in Betta tanks

Post by bronzo »

If you're using a sponge filter, it might not be cycled fully. How long has the tank been running? You might need to add some bottled bacteria to speed things up.
brookhun
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Joined: Thu Oct 10, 2024 8:56 pm

Re: Ammonia levels in Betta tanks

Post by brookhun »

Thanks for the tips, everyone. I'll test my tap water and check the conditioner. Tank's been running for about a month, so maybe it's still cycling.
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ember
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Joined: Thu Oct 10, 2024 5:16 am

Re: Ammonia levels in Betta tanks

Post by ember »

A month should be enough time, but if you're seeing ammonia, it's not quite there. Try cutting back on feeding to once a day and see if that helps.
bigrig22
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Joined: Sat Jan 13, 2024 10:12 pm

Re: Ammonia levels in Betta tanks

Post by bigrig22 »

florapex wrote: Thu Jun 05, 2025 9:19 am How often are you doing water changes? In a 5-gallon, you might need to do them more frequently, like 20% every 3 days. Also, check if you're overfeeding, that's a common cause.
Yep, overfeeding's a big one. Uneaten food rots fast in small tanks.
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finnx
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Joined: Thu Oct 10, 2024 3:12 am

Re: Ammonia levels in Betta tanks

Post by finnx »

My tank was sketchy too until I added some live plants. They help suck up ammonia like crazy. Maybe try some anubias or java fern?
cannon
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Joined: Thu Oct 10, 2024 5:53 pm

Re: Ammonia levels in Betta tanks

Post by cannon »

Live plants are a great idea. Also, make sure you're not cleaning the filter with tap water. Chlorine kills the good bacteria. Rinse it in tank water instead.
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