Thay một phần nước trong bể. Vớt tất cả các chất hữu cơ dư thừa trong bể ra ngoài. Giảm số lượng thức ăn và tần suất cho cá ăn. Đưa lợi khuẩn vào trong nước. Giảm độ pH trong bể. Tăng lưu thông nước. Dùng dung dịch trung hòa.

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Partial water changes are an excellent and efficient way of reducing ammonia levels and maintaining a clean tank for your fish. You should aim to do a partial water change about once a week, though you may need to do it more often, depending on your tank's conditions. A good way to check if you need to do partial changes more frequently is by stirring up the substrate gravel with a fish net. If a lot of debris floats up, it's a good sign you're not changing the water often enough.  Let fresh water sit out overnight to dechlorinate, or treat the fresh water with a dechlorination product. Wash your hands and make sure you've washed away all residue of soap, lotions, and other potential contaminants. Dry your hands with a clean paper towel. Disconnect any electrical appliances near the fish tank to prevent any risk of accidental electrocution. Wait to reconnect those appliances until you've finished changing the water and checked that everything is dry. For an otherwise healthy tank, you can aim to replace about 30% of the water. In a 10 gallon (37.9 L) tank, that means replacing 3 gallons (11.4 L) of water. You don't necessarily need to remove the fish for a partial water change. Just be careful as you put your hands in the tank so you don't startle the fish. Scrape off any algae that's grown on the walls of the tank. You can buy a specialized tool for scraping algae, or simply use an old credit card. Use a siphon tube to drain out 30% of the old water into a bucket or nearby sink. When you've removed enough of the old water, slowly pour in the fresh, dechlorinated water. Decaying organic matter is a large factor in elevated ammonia levels. By using a fish net to scoop out anything that shouldn't be there (basically anything but the living fish and plants you want in the tank), you can help lower ammonia levels and prevent them from rising.  Uneaten food is a large contributor to ammonia levels. Fish waste can also cause spikes in ammonia as it decomposes. Dead plant matter or dead fish left in your tank will...