Betta fish and water change schedules

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tanger
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Joined: Sat Jul 06, 2024 6:10 am

Betta fish and water change schedules

Post by tanger »

How often do you guys change the water for your bettas? I've been doing weekly 25% changes, but my fish seems stressed after. Tank is 5 gallons, heated to 78F, with a sponge filter. Wondering if I'm overdoing it.
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windy
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Joined: Thu Oct 10, 2024 2:14 am

Re: Betta fish and water change schedules

Post by windy »

Weekly changes are pretty standard for a 5 gallon. What's your water source? If you're using tap, maybe the conditioner isn't cutting it. I use Seachem Prime and let the water sit for an hour before adding it.
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techy
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Joined: Wed Jun 21, 2023 6:48 pm

Re: Betta fish and water change schedules

Post by techy »

tanger wrote: Sun Jun 29, 2025 10:10 pm How often do you guys change the water for your bettas? I've been doing weekly 25% changes, but my fish seems stressed after. Tank is 5 gallons, heated to 78F, with a sponge filter. Wondering if I'm overdoing it.
Stress could be from temp swings. Are you matching the new water temp to the tank? Even a 2-degree difference can mess with them. Also, check your ammonia levels between changes.
flintox
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Joined: Thu Oct 10, 2024 4:36 pm

Re: Betta fish and water change schedules

Post by flintox »

I do 20% every 10 days for my 10-gallon. My dude's chill with it. Maybe cut back to 15% weekly? Less disruption, same cleanliness over time.
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rockyfox
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Re: Betta fish and water change schedules

Post by rockyfox »

Agree with techy on temp matching. I use a digital thermometer to double-check. Also, how's your flow? Sponge filters are gentle, but if it's too strong, that could add stress.
kayaks
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Joined: Thu Oct 10, 2024 7:25 pm

Re: Betta fish and water change schedules

Post by kayaks »

yo i just change when the water looks sketchy. my betta's alive so i guess it works? lol
cipher
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Joined: Thu Oct 10, 2024 6:39 pm

Re: Betta fish and water change schedules

Post by cipher »

kayaks wrote: Mon Jun 30, 2025 3:58 am yo i just change when the water looks sketchy. my betta's alive so i guess it works? lol
That's... not ideal. Ammonia builds up before you see it. Get a test kit, dude. API Master Kit is gold.
_rivulet
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Joined: Tue Mar 15, 2022 11:40 pm

Re: Betta fish and water change schedules

Post by _rivulet »

I've had success with 20% weekly in my 5-gallon, but I drip-acclimate the new water over an hour. Slower changes = less shock. Also, Prime is a must.
baker
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Joined: Thu Oct 10, 2024 4:02 pm

Re: Betta fish and water change schedules

Post by baker »

if your fish is stressed, try smaller changes more often. like 10% twice a week. keeps things steady.
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