Dissolved oxygen

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1. Dissolved oxygen and its usefulness

Oxygen and CO2 are two essential parameters for the good health of your fish and plants. The system was designed to naturally promote a good oxygen concentration and the circulation of CO2.

The level of dissolved oxygen in the water must be high and the CO2 must be properly removed so that the plants can use it.

This is one of the reasons why the fish tanks are not covered: the circulating and falling water helps increase the DO (dissolved oxygen) level and remove the CO2 produced.

2. Maintaining your dissolved oxygen level

1. A sharp increase in temperature lowers DO in the water

In summer, fish may have more difficulty breathing if it is too hot. If you see fish looking for water at the surface, remove one or two towers in the centre of the system and let the water fall from the top; this will increase DO in the water. Conversely, oxygen is rarely lacking in winter.

2. Algae proliferation can consume DO

See the page "Limiting algae growth"

3. The fish feeding frequency must remain constant

Avoid changes in the feeding rhythm, as this could affect DO. Make sure to feed the fish at fixed times.

4. Watch out for high salt concentration

Avoid aquarium salt or excess supplements.

5. Change in fish size / introduction of new fish

Some fish are very sensitive to oxygen levels. It may be recommended to add an air pump / aerator for some fish (trout for example), especially if you are in a hot region.

6. Quickly remove any dead fish from the fish tank

As mentioned earlier, make sure to remove any dead fish or uneaten food from the fish tanks very quickly.