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Video description
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Nitrate are the last nitrogen molecule of the nitrogen cycle and are directly available by the plants. They are beneficial for the plants but we must keep them below a certain limit as they can affect your fish health.

How Nitrate appear in the aquaponics system?
They are produced by bacteria from nitrite.

What action do they have on fish?
They can generate the following defects:
Deformity
Strange behaviour (swim on the side, gap on the surface)
Poor feed conversion
Poor growth
Fast swimming
More disease
As you can see the impact of a high nitrate level on fish can be dramatic. For your fish welfare please keep them at an acceptable level.

What action do nitrate has on plants?
Nitrate are the main source of nutrients for the plants. Limited concentrations from 5 to 25ppm are perfect

What is an acceptable nitrate level for your fish?
Carps, catfish, goldfish and tilapia can leave in nitrate levels up to 120ppm but it is recommended to keep them 50ppm, with a target below 30ppm.
For trouts some sources report acceptance of levels above 500ppm but some scientific studies have shown effects below 100ppm! I would recommend to keep them in low concentration such as 30ppm as well.
How to balance nitrate in your aquaponics system?
If your nitrate are too high it may be because you don’t have enough plants to consume the production of your bacteria.
One of the options is to increase the number of plants in your system.
Another option is to use the aquaponics water to water your classic garden. It will lower the water level in your tanks and you will be able to top up the tank with new water which will dilute the nitrate and lower the concentration.
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Link of the vidéo
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What is a good nitrate level in aquaponics:    • What is a good nitrate level in aquaponics