In fact, the water in the fish tank is constantly changing, because the fish are constantly eating, defecating, visible food residues, invisible harmful substances and so on will continue to accumulate in the fish tank. No matter how powerful your filtration is, no matter how stable your aquarium ecology is, it will generally accumulate over time. Whether changing water every week or once or twice a year is just a matter of changing water time, and it is generally impossible to reach the level of never changing water.
It further shows that changing water is the most direct method to reduce harmful substances in water. In fact, with the growth of fish, many substances in the water are constantly consumed in the simple ecological environment of the fish tank and cannot be regenerated, so these missing minerals and trace elements can be supplemented by changing water.
Fish culture and water exchange knowledge
Old fish friends know that old water generally has colors, some are yellow and some are green. Although the water is relatively clear due to the powerful filtration system, the color of the water will affect the depth of sunlight. By changing water, the transparency of water body can be improved, and certain skills should be mastered in fish farming, and relevant knowledge should be learned before fish farming.
Only about 10% to 30% water can be changed at a time, and a large number of water changes will easily lead to the collapse of the nitrification system, which is more troublesome. If there are heating rods, fish tank lights and other equipment, it is best to turn off the power supply to change water, because sometimes the heating rods are easy to crack or overheat when they meet water.