How To Clean A Betta Fish Tank: 11 Steps (with Pictures) - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Clean a Betta Fish Tank PDF download Download Article Co-authored by Craig Morton

Last Updated: February 24, 2025 Approved

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  • Preparing to Clean a Betta Fish Tank
    • |
  • Washing a Betta Fish Tank
    • |
  • Video
    • |
  • Expert Q&A
    • |
  • Tips
    • |
  • Warnings
    • |
  • Things You'll Need
|Show more |Show less X

This article was co-authored by Craig Morton. Craig Morton is the CEO of Aquarium Doctor Inc. based in Huntington Beach California and servicing Orange County, Los Angeles County, and the Inland Empire. With over 30 years of aquarium experience, Craig specializes in creating custom aquarium designs along with aquarium installation, service, and maintenance. wikiHow marks an article as reader-approved once it receives enough positive feedback. This article has 22 testimonials from our readers, earning it our reader-approved status. This article has been viewed 661,061 times.

Bettas are extremely lovable and actually quite intelligent pets that are very easy to care for. However, they eat and excrete just like any living creature. That's why cleaning out their tank is very important. While a betta won't require walking or regular trips to the veterinarian, it does require that you keep its tank and water clean for it to stay happy and healthy.

Steps

Part 1 Part 1 of 2:

Preparing to Clean a Betta Fish Tank

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  1. Step 1 Wash your hands! 1 Wash your hands! Take the time to make sure you don't have dirty hands. You want to make sure that you don't accidentally introduce germs or dirt into the tank while you clean it.
    • If you use soap, make sure to rinse it off thoroughly. Soap residue can kill fish.
  2. Step 2 Unplug any heaters, filters, lights, and other equipment before you start. 2 Unplug any heaters, filters, lights, and other equipment before you start. It is important to keep all electrical appliances unplugged and away from the tank while you are cleaning it. While these appliances should be made for use in a fish tank, you do not want them to accidentally fall into the tank or be otherwise submerged in water. Advertisement
  3. Step 3 Gather the tools and materials you will need. 3 Gather the tools and materials you will need. To clean the tank you will first need to set up a safe and clean place to stash your fish. Find a clean cup or bowl that you can put the fish in. Take some of the water from the Betta's existing tank and place it into the glass or bowl; You will need just enough water so that the fish will have a little room to swim around. In addition, you will need the tools to clean and refresh the tank's water.
    • You will also need: a sink, a plastic cup or net to scoop the fish and water, paper towels and a scrubber to clean the inside of the tank, water conditioner (which is available at most pet or aquarium stores), a sieve to use when cleaning tank gravel, and a plastic spoon.
  4. Step 4 Scoop water out of the tank. 4 Scoop water out of the tank. Using a small cup, scoop out 50% to 80% of the water in the tank. Set it aside so that it can be used later on in the tank. This has to be done because you cannot change the water entirely, as it might put the betta into shock. Instead, you will put the water you set aside back into the tank, after it is cleaned.
    • If you are a new owner, you can start by 50% water changes and gradually increase it till you reach 80%.
    • Most of the filth in a betta's tank is in the gravel at the bottom. If you take the water off the top, then you will still be getting rid of most of the dirt and grime when you clean the gravel.
  5. Step 5 Remove the fish from the tank. 5 Remove the fish from the tank. Once you have removed some of the water from the tank, scoop your fish with the same cup. Take your time and be careful of the fish's fins. If you go really slow, you may be able to get the fish to settle into the cup while it is underwater, and then you can simply lift it straight up.
    • Place the fish into the glass or bowl that you have already filled with tank water.
    • Keep in mind that while doing this you need to make sure the fish doesn't jump out. Bettas are known jumpers, so put a lid on whatever container you are keeping the fish in.
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Part 2 Part 2 of 2:

Washing a Betta Fish Tank

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  1. Step 1 Empty the tank. 1 Empty the tank. Drain the remaining water out of the tank through a sieve into the sink. This will prevent any gravel from falling down the drain.
    • Remove any decor that is in the tank as well. You can simply set it on top of the gravel in the sieve.
  2. Step 2 Run the gravel under warm water. 2 Run the gravel under warm water. Fold the gravel with your hand and shake it side to side to get the dirt, poo, and left over food out. Use your hands to do it really thoroughly.[1]
  3. Step 3 Rinse the tank and decor with warm water. 3 Rinse the tank and decor with warm water. Use a soft scrubber to scrub the glass. Dry the decor well with a paper towel and put it to the side.
    • Never use soap on anything in a fish tank, including the tank itself.[2] The residue is likely to remain and hurt your betta.
  4. Step 4 Refill the tank. 4 Refill the tank. Place the gravel and plants back into the tank before you refill it. Then pour new water into the tank and condition it. Follow the directions on the package of conditioner to determine how much conditioner to put in your fish's tank.
    • Use a plastic spoon to stir the water, making sure that the conditioner is mixed into the new water thoroughly.
    • Remember to reserve enough room for the original water that you took out of the tank. Pour the old water you reserved back into the tank once the new water has been conditioned. Stir it all together well.
  5. Step 5 Wait 24 to 48 hours for the water to settle and come to room temperature. 5 Wait 24 to 48 hours for the water to settle and come to room temperature. The tank water must be the same temperature as the water was before, and should be between 72 to 80 °F (22 to 27 °C). Your fish WILL die from stress if you change the temperature too quickly.
    • Water coming to room temperature could take a while. Check the water after 24 hours using a thermometer to make sure the water temperature matches the ambient temperature in the room. If it is not room temperature, wait a few more hours and then check it again.
  6. Step 6 Reintroduce the betta to its tank. 6 Reintroduce the betta to its tank. Slowly put the cup (where you kept your betta) into the tank and tilt the cup a bit. Your betta will slowly come out of the cup by itself. Be gentle while you're doing this, as you might hurt it's fins.
    • Keep an eye on the betta. Once you let it go, it'll soon start exploring the tank. Set your tank back to where it was and enjoy as it swims around observing everything!
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Expert Q&A

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  • Question How often should I do partial water changes? Craig Morton Craig Morton Aquarium Specialist, CEO of Aquarium Doctor Inc. Craig Morton is the CEO of Aquarium Doctor Inc. based in Huntington Beach California and servicing Orange County, Los Angeles County, and the Inland Empire. With over 30 years of aquarium experience, Craig specializes in creating custom aquarium designs along with aquarium installation, service, and maintenance. Craig Morton Craig Morton Aquarium Specialist, CEO of Aquarium Doctor Inc. Expert Answer I would recommend doing partial water changes about once every week. If you have an unfiltered tank, you should change 30-50% of the water. Or, if you have a filtered tank, you can change 20-25% of the water. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 10 Helpful 29
  • Question Will my fish die if I don't clean his tank? Community Answer Community Answer Yes. The dirty tank will make germs that you don't want in your tank, so you might end up with a sick fish. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 25 Helpful 201
  • Question Do I have to put water conditioner in the tank? Community Answer Community Answer Yes, if you are using tap water, then conditioning the water is necessary. The chemicals in tap water will kill your betta fish if you don't use a conditioner. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 38 Helpful 224
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Video

Reader Videos

Tips

  • Be sure to play and interact with your Betta daily as much as possible. Put it in a spot that will be visible, so that they will get to know you, and you will get to know them. Thanks Helpful 18 Not Helpful 2
  • If you do have a tank, you can change it every weekend. Bettas need a big tank. Don't get them a bowl or vase as they don't like small spaces. The bigger the better. Thanks Helpful 20 Not Helpful 4
  • There shouldn't be any hard plastic plants in the tank, as they might hurt or tear the fish's fins. If you do get plastic pants, try the 'pantyhose test'. Rub them against a pair of pantyhose and see if they snag or tear it. If they do, they can tear your betta's beautiful fins and tail. It is best to use Silk plants or live plants, as live plants provide a place for the bettas to lounge on. Plus, live plants can also oxygenate the water. Thanks Helpful 14 Not Helpful 4
Show More Tips

Tips from our Readers

The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.
  • You don't actually need to remove your betta from their home when changing the water or cleaning the tank. In fact, you probably shouldn't if you can help it! When you change the water, just remove about 25-50% a week, and leave the fish in the tank. Use water conditioner for all new water.
  • Make sure and get a good heater. The ideal temperature for a Betta is 78-80 degrees F (25.5-26.6 degrees C). Usually, you won't be able to attain this temperature by just using room temperature. Investing in a decent heater will make your Betta much happier.
  • If you don't have a heater yet, you can use a plastic bottle filled with hot water and place it into the tank, for the time being. When the temperature drops, refill the bottle with more hot water.
Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement

Warnings

  • Always be careful while handling your betta. If you are not gentle, it could get hurt. Thanks Helpful 112 Not Helpful 14
  • Never leave your betta alone when on a trip (for more than 3 days). Ask a friend to come over and feed it and change its water. Thanks Helpful 99 Not Helpful 26
  • Change out 100% of the water if there is a problem or if you are temporarily keeping your betta in something less than 2.5 gallons. Thanks Helpful 14 Not Helpful 10
  • Don't put your betta by any sunny windows or vents or dusty areas. Sunshine can promote algae growth and dusty or breezy areas can increase the dirt in the tank.[3] Thanks Helpful 1 Not Helpful 0
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Things You'll Need

  • Sink
  • A plastic cup
  • Paper towels
  • Water conditioner
  • Sieve
  • Plastic spoon

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References

  1. ↑ http://animals.mom.me/rid-food-bottom-betta-tank-8620.html
  2. ↑ http://www.bettalove.com/How-To-Clean-a-Betta-Fish-Tank.htm
  3. ↑ http://www.bettalove.com/How-To-Clean-a-Betta-Fish-Tank.htm

About This Article

Craig Morton Co-authored by: Craig Morton Aquarium Specialist, CEO of Aquarium Doctor Inc. This article was co-authored by Craig Morton. Craig Morton is the CEO of Aquarium Doctor Inc. based in Huntington Beach California and servicing Orange County, Los Angeles County, and the Inland Empire. With over 30 years of aquarium experience, Craig specializes in creating custom aquarium designs along with aquarium installation, service, and maintenance. This article has been viewed 661,061 times. 19 votes - 74% Co-authors: 57 Updated: February 24, 2025 Views: 661,061 Categories: Featured Articles | Betta Article SummaryX

To clean a betta tank, scoop most of the water out of the tank and pour it into a bowl, then scoop out the fish and place it into the bowl as well. Drain all of the remaining water out of the tank. Rinse the gravel, tank, and decor under warm water, then place the gravel and plants back in the tank. Pour a little fresh water into the tank, condition it, and fill the rest of the tank with the original water you reserved. Wait 24-48 hours for the water to settle and come to room temperature before you replace the fish. Keep reading to learn about the safety precautions you should follow when cleaning your betta tank. Did this summary help you?YesNo

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Reader Success Stories

  • Olivia Derie

    Olivia Derie

    Sep 18, 2017

    "This helped a lot because I would just scoop out some water, put the conditioner in, and say I was done. Now that I..." more Rated this article:
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Did this article help you?

Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Craig Morton Co-authored by: Craig Morton Aquarium Specialist, CEO of Aquarium Doctor Inc. 19 votes - 74% Click a star to vote Co-authors: 57 Updated: February 24, 2025 Views: 661,061 Olivia Derie

Olivia Derie

Sep 18, 2017

"This helped a lot because I would just scoop out some water, put the conditioner in, and say I was done. Now that I..." more Rated this article: Donna Dozier

Donna Dozier

Apr 15, 2017

"I enjoy Midnight, our family's betta fish, and I want to keep our little friend in a good environment. He is a..." more Rated this article: Christie Con

Christie Con

Aug 25, 2016

"The step by steps were the best. First-time Betta fish owner and I have to make sure he is alive when my daughter..." more Anonymous

Anonymous

May 19, 2018

"It helps to know betas need more room. The pet stores minimize this. My betta is much happier since I put him in a..." more Emily Greenslade

Emily Greenslade

Jul 8, 2019

"This article helped me a lot! I got my first betta (male) about 8 months ago, using an old 10-gallon tank and some..." more Share yours! More success stories Hide success stories

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