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. 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. 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. 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. 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. 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. 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.
اغسل يديك بالمياه الجارية. أخرج سمكة البيتا من الحوض إذا كان صغيرًا. نظّف الحوض من الداخل باستخدام إسفنجة جديدة أو قطعة قماش. أفرغ 20% من مياه الحوض. نظّف الجزء الخارجي من الحوض بأداة مختلفة (اختياري). أضف المياه الجديدة للحوض. أعِد سمكة البيتا إلى الحوض.