How To Check The Water In The Aquarium

Any fish is very sensitive to the chemical composition of water. If you are concerned about the health of your fish, if you are just starting your way to an aquarist and fill a new aquarium, or if your fish is sick, then this is the time to check the chemical composition of the water.

It is worth remembering: There is no single test for determining "bad" or "good" water in an aquarium; its composition is very complex and has many parameters that are measured separately.

The most popular parameters are:

Such tests are most popular and do not require deep knowledge of water hydrochemistry from an aquarist. In fairness, it should be noted that they do not always give correct results, they have a high proportion of distortion inherent in them, but this is not critical for domestic needs. There are more reliable methods, but they are time consuming and / or require special knowledge, as well as often expensive equipment.

Classic water test using a test

Step number 1.Purchase a test kit. For novice aquarists who are poorly familiar with the characteristics of the composition of the aquarium water, it is recommended to purchase a test set for all parameters. It costs more, but it provides ample opportunities for experimentation and self-study with practical examples. In addition, it is always better to take in bulk, rather than in retail, and as needed, replenish the completed tests in the kit.

Step number 2. Take a test tube, if not included, you can use any transparent small container, such as a glass, glass and other. Rinse thoroughly and dry. Remember that the remnants of the cleaning agent will greatly affect the results.

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Step number 3. Gather the required amount of water from the aquarium (the required amount is indicated in the instructions). If there is a test tube in the kit on it, as a rule, it is marked with a sign on how much water to draw.

Step number 4. Add the required reagent indicator drop by drop to the collected water (to determine dGH, pH or other). In this case, you should strictly follow the instructions, otherwise you risk getting incorrect results.

Step number 5. Shake water with reagent indicator (unless indicated otherwise).

Step number 6. Wait 5 minutes (unless otherwise indicated in the instructions).

How To Check The Water In The Aquarium

Step number 7. Compare the color of the resulting water in the reference map. The hue may not always coincide with a specific color in the map, it is often in the range of neighboring colors, but this is enough to determine the value of the indicator (pH level, water hardness, etc.).

Step number 8. Pour the water out of the tube and wash well for the next use.

Step number 9. Based on the results obtained, measures should be taken, for example, if the water is too hard for your inhabitants, it should be softened, etc.


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basic information

  • How to choose an aquarium
  • Equipment
  • Filters and filter media
  • Lighting system
  • Calculation of the illumination of the aquarium
  • Colour temperature
  • Heating systems
  • Aeration system
  • Design Elements
  • Dutch aquarium
  • Natural aquarium
  • Iwagumi aquarium
  • Aquarium jungle
  • Soil (substrate)
  • Water parameters
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    • Hydrochemical composition of water
    • Determination and change of dGH and pH
    • How to make soft water
    • Gas content
    • Nitrogen cycle
    • Redox potential
    • Fish nutrition
    • Running aquarium
    • Aquarium Care
    • Information section "Fish" in terms of scientific names and habitat conditions
      complies with materials FishBase – global catalog of fish species,
      coordinated by the Leibniz Institute of Marine Sciences.