Changing the water in the aquarium - this is how it should be

Even if the term change of water could suggest this, it is never necessary to change the complete amount of water. On the contrary, it would even be very damaging to the fish if too much water was poured in fresh. Here we show you the rhythm in which the water should be changed and the approximate amount.

How often does the water have to be changed?

Depending on how well the aquarium is running and how healthy and retracted the system is, the time at which a water change must be carried out can be between a few days and several weeks. On average, one can say that a small part of the water needs to be renewed every two weeks.

How much water needs to be exchanged?

The water must never be completely replaced, because the tap water lacks the necessary bacteria that make the aquarium in the first place to run. However, to ensure that fresh water enters the closed circuit of a basin, new water must be added from time to time.

The water balance of an aquarium is basically contaminated mainly by the fish. Your feces and the leftover food pollute the water with pollutants that would become excessive. However, the old water is a particularly good fertilizer for flowers and green plants.

Small water change

If the aquarium runs particularly well, one does not want to disturb the water balance by a too large water change. Then it is sufficient, for example, in a small 60-liter aquarium just exchange a 10-liter bucket of water. That should be taken directly from the bottom with a mud sucker, so you get most of the pollutants.

Big water change

If the ecosystem of the basin is in imbalance or the water is cloudy, then a large water change should be carried out. This can literally repair many problems that an aquarium may have over time.

  • small water change about 20 percent
  • normal water change about 40 to 60 percent
  • big water change about 80 percent

Course of the water change

  • Turn off the power
  • Run the water in a bucket with the sludge sucker
  • Clean pump and filter
  • If necessary, add water conditioner to the fresh water
  • Slowly pour lukewarm water from below
  • never simply pour in water in one go
  • wait until the water clears before switching on the pump
  • Add water from the aquarium to the toilet or use it as a flower fertilizer

Tips & Tricks

Pretty much anyone who owns an aquarium will give you a slightly different advice on how to keep it with the water change. The most important thing is actually your own instinctive feeling, which develops over time. Until then, you should just be careful and act after the less is more principle. Especially when it comes to water additives, stinginess is needed.

Video Board: When And Why Do Water Changes on a Fish Tank