How long should tap water be left to stand before it can be used for keeping fish?

Tap water that has been held and left to stand for 2-3 days can be used for keeping fish. In actual fish keeping, to keep the aquarium water clear and rich in oxygen, the aquarium needs to be changed frequently. In order not to change the water quality and temperature abruptly, the water change generally uses the method of mixing in water; do not replace all the water at once, so as to avoid the fish developing illnesses from not adapting to the water quality and temperature. If food residue and waste can be filtered out, changing one tenth of the water every day is enough.

An introduction to several kinds of water involved in fish keeping!

1. Raw water

Tap water or well water that has not been treated by drying in the sun; its water temperature often differs considerably from the water temperature in the aquarium, and tap water contains a relatively large amount of chlorine gas, so this kind of water is extremely harmful. Some market vendors, when selling, directly pour tap water into the tank to make the water quality in the aquarium clear and transparent to attract customers, but doing so often causes the fish to suffer losses.

2. New water

Clean water made from tap water or well water or spring water that has been placed indoors or outdoors to dry in the sun, stand still and settle for about 2-3 days, and whose temperature is equal or similar to the aquarium water temperature.

3. Stale water

Dirty water containing feces and filth at the bottom of the aquarium. This includes rearing water in the tank that has not been changed for a long time.

4. Old water

The collective term for water in the aquarium that is clean and shows tender green, green, old green or green-brown, among which tender green water quality is the best. Old water contains more floating green algae, and these are also very good supplementary feed for goldfish. This kind of water has little decomposed organic matter and more dissolved oxygen; keeping goldfish in tender green and clean old water most often produces fish with the strongest appetite, robust bodies, bright colors and very fast development.

5. Clear-again water

When the old green water in the tank suddenly turns into clear water and much of the green algae settles to the bottom of the tank, this phenomenon is called clear-again water. This kind of water quality most easily causes goldfish to become ill. When beginners encounter this situation, they should replace all the water in the aquarium with new water that has been cooled after drying in the sun, but they should not clean the filter media in the circulation system, as the beneficial nitrifying bacteria inside are helpful for the new water to transform into tender green water.

Summary: The above content is the introduction we have compiled for you on how long tap water should be left before it can be used for keeping fish. We hope it can help friends in need.