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Three Parts:Preparing to CleanCleaning a Betta Fish BowlPerforming a Major CleanCommunity Q&A

Since betta fish get oxygen from the air, they can survive in a fish bowl without an aquarium filter. However, a small fish bowl can stress the betta fish and shorten its lifespan. Moreover, the bowl must be cleaned constantly, to keep it in top condition. The actual cleaning process is not difficult, as long as you know what to do, but investing in a tank or at least a large bowl will make cleaning safer and less tedious.

Part 1
Preparing to Clean

  1. 1
    Decide how often to clean the bowl. The main way to keep a fish bowl clean is to change some of the water in it. However, this process can stress or even kill the fish by disrupting the bacterial and chemical contents of the water. Follow this guide to keep your bowl contents healthy without changing the water unnecessarily often:
    • Clean 0.5 gallon (2 liter) bowls daily, 1.5 gal. (6 L) bowls twice a week, and bowls 3 gal. (12 L) and up once a week.
    • If your bowl has a water filter, you can wait twice as long between cleanings.
  2. 2
    Choose new water. During the cleaning and water change, you'll remove about 20%–25% of the water in your fish bowl. The replacement water should be prepared at least 30 minutes in advance, to allow time for treatments to work. You may use tap water, distilled water, or rainwater, but be sure to follow the advice below to make it safe for your betta. Leave this out at room temperature in a clean, soap-free container while you clean the tank.
    • Do not use rainwater in an area with acid rain.
  3. 3
    Add a dechlorinator to tap water. This is sold at pet stores as "dechlorination tablets" or "water conditioner," and are used to break down chlorine and other chemicals harmful to fish. Add this to the tap water, following the instructions to treat the amount of new water you are adding. This usually takes at least 30 minutes to take effect.
    • Skip this step if using distilled water or rainwater.
  4. 4
    Add aquarium salts (optional). Aquarium salts for betta fish or goldfish can be added in small amounts as instructed on the packaging. This can help the fish thrive, but is not necessary to survival. This step is recommended if the fish has patchy, diseased skin, or if the water in the bowl is 100% distilled water.
  5. 5
    Check the temperature. Betta fish are tropical fish, and prefer temperatures around 74–82–F (23-28ºC), or just a little warmer than "room temperature." If the new water is not near this temperature, or if it feels colder or warmer than the water in the fishbowl, leave it in a warm room until it reaches a safe temperature.

Part 2
Cleaning a Betta Fish Bowl

  1. 1
    Wash your hands with plain water. Wash your hands to remove traces of dirt and soap before cleaning the tank. Do not use soap to wash your hands, as soap can harm or kill your fish.
  2. 2
    Move the betta if the bowl is small. Leaving the betta in the tank is usually best for the fish. However, if the fish bowl is too small to easily reach in and clean without hitting the fish or blocking its access to the air, move the fish before cleaning. Transfer some water from the fish bowl to a clean, soap-free container, then use a fishnet to transfer the betta.
    • Leave at least 3 inches (7.5 centimeters) of space above the water level in the new container, so the betta cannot jump out.
  3. 3
    Scrub the inside with a brand new sponge or cloth. Even tiny traces of soap or other substances can harm your fish. Use a brand new sponge, or a cloth that has recently been through a washing and rinsing cycle and not used for any purpose since then. Rub the inside of the bowl in circular motions to remove slime and dirt.
    • A sponge attached to a handle may be the easiest tool to use.
    • You can use the same sponge to clean off rocks and other decorations too.
  4. 4
    Remove 20% of the fish bowl water. Use a siphon, bucket, or cup, making sure the tool is clean and soap-free, to remove about a fifth of the water from the fish bowl. You may use this in the garden, or dump it down a drain.
  5. 5
    Clean the outside with a different tool (optional). If the outside of the bowl is dusty or grimy, you may clean it with any ordinary sponge or cloth. You may use Windex, soap, or other cleaning products, as long as you are careful not to let any of it drip inside the bowl.
  6. 6
    Add the new water to the bowl. Only use water carefully selected or prepared with the instructions in the preparation section. If the fish is in the bowl, pour the water in slowly to avoid disturbing the fish with strong currents.
  7. 7
    Return the betta to the bowl. If you removed the betta fish for cleaning, use a fishnet to transfer it back into the bowl. If you are worried that the water temperature has changed, or if you accidentally changed more than 50% of the water, instead transfer the fish and the water it's swimming in to a small plastic bag. Float this bag on the surface of the bowl for 15–20 minutes, then let the fish swim into the bowl and remove the bag.

Part 3
Performing a Major Clean

  1. 1
    Use this method only when absolutely necessary. You do not need to do a major cleaning unless the bowl has developed slime or grime you cannot scrub off, or if the water has become permanently cloudy. The more involved the cleaning is, and the more water you replace, the more stressed your fish will be. If the fish bowl is an adequate size for your betta fish, at least 3 gal. (6 L), you will only need to clean it this way once or twice a year.
  2. 2
    Prepare a new container of water. You'll be replacing about 50% of the water in the fish bowl. Use tap water treated with dechlorination tablets, freshly collected rainwater, or distilled water treated with aquarium salts. Check the water temperature to make sure it matches the water in the fish bowl.
    • See the preparation section for more information on preparing aquarium water.
  3. 3
    Transfer half the water and the betta to another container. Move roughly 50% of the water in the fish bowl to another container. Even if the water looks filthy, do not transfer your betta to a container of new water. The shock could kill it.
    • Keeping the old water also insures that you will still have useful bacteria in your fish bowl, which will break down otherwise harmful chemicals produced by your fish's waste.
  4. 4
    Empty the fish bowl. Separate out any gravel, pebbles and decorations by pouring the water through a sieve standing on a bucket, or by scooping them out with a cup. Dump the remaining water into your garden or down a drain. If your bowl is too heavy to handle easily, use a siphon hose instead to transfer the water to a bucket in stages.
  5. 5
    Rinse the contents twice. Rinse all gravel, pebbles, and decorations once in a basin of hot water to remove as much grime as possible. Pour out the hot water and rinse a second time in cool or room temperature water. Rub them with your fingers or your dedicated aquarium sponge while rinsing the second time.
  6. 6
    Scrub the fish bowl with vinegar if necessary. If water and elbow grease alone won't remove the gunk on the fish bowl, wet a cloth with white vinegar and scrub the sides. Always thoroughly rinse the vinegar in room temperature water after the fish bowl is clean.
    • Never use any soap, cleaning products, or any substance besides water or vinegar to clean your fish bowl.
  7. 7
    Set up the fish bowl again. Return the gravel, pebbles, and/or decoration to the fish bowl. Pour in the newly prepared water. Pour in most of the old water, but leave enough in the temporary container for your betta to swim. Wait for the clouds and gravel to subside to the bottom if necessary.
  8. 8
    Return the betta fish to its bowl. Because of the major changes to the bowl, introducing your fish slowly is recommended. Float the betta fish and the water it's been swimming in inside a small plastic bag, on top of the bowl water. After 15 minutes, pour a little of the bowl water into the bag. After 30 minutes, let the betta swim out of the bag into the rest of the bowl, and remove the bag.

Community Q&A

Add New Question
  • Do I have to use a filter?
    wikiHow Contributor
    No, but if you have a filter, you will only have to clean the bowl once a month, as opposed to once a week.
  • What if I don't have a net?
    wikiHow Contributor
    If you have a piece of net of some sort, use that. You could also use a soup spoon (don't use it for soup again afterwards). But your best bet is to go to the store and buy a fish net.
  • Will rain water contain bacteria that harms betta fish?
    wikiHow Contributor
    Yes, do not add rain water to your betta's tank.
  • How often do I need to clean my fish bowl?
    wikiHow Contributor
    Once a week with conditioner. Twice with no conditioner. If it gets foggy, clean it ASAP.
  • What happens if I've been changing all the water every time and putting in completely new water?
    wikiHow Contributor
    Make sure it is the same temp each time you change it, because it can stress out the fish. If you take out the fish, get a container and put the old water in it.
  • Can a betta survive with tap water along with complete water changes?
    wikiHow Contributor
    It can only if you follow step 3 here.
  • Is it OK to have live aquarium plants in fish bowl?
    wikiHow Contributor
    It would be better to use fake plants. If you want to use real plants, please make sure that they are clean and don't use dirt. If your water gets foggy, take them out asap! Also you would need to clean the water more often, possibly change 20% 2-3 times a week. If the fish looks stressed take them out and clean the whole tank.
Unanswered Questions
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  • For a healthier betta fish and an aquarium that stays clean for longer, set up a larger tank for the betta instead of a bowl.
  • Consider using a stress coat before and after cleaning, to reduce stress.
  • It's easier to use a net to get fish out of the bowl. If you don't have one, however, you can use a cup instead.


  • Soap can harm or kill your fish. Do not use it.
  • It is not a good idea to keep bettas in a bowl, as they need proper filtration, a heater, plants, places to hide, and adequate swimming room. The minimum aquarium size for a betta is 5.5 gallons.

Article Info

Categories: Betta

In other languages:

Español: limpiar la pecera de un pez beta, Italiano: Pulire la Boccia di un Pesce Betta, Português: Limpar Aquários de Betta, Русский: почистить круглый аквариум бойцовой рыбки, Deutsch: Ein Fischglas mit Kampffischen reinigen, Français: nettoyer l'aquarium de votre combattant, Bahasa Indonesia: Membersihkan Mangkuk Ikan Cupang, Nederlands: Een vissenkom van een Siamese kempvis schoonmaken

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