PhytaGen N1

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Nitrogen supplement for planted aquaria

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PhytaGen N1 is a Nitrogen mineral supplement for aquaria.

The use of PhytaGen N1 is advisable in the cultivation of fast-growing aquatic plants and / or where their nitrogen needs can not be guaranteed by the organic substances introduced by other routes (eg through the bottom or the introduction of feed for fish).

With PhytaGen N1 Nitrogen is supplied predominantly in oxidized form (Anion Nitrate: NO3-); but there is also a minority share in reduced form (Cation Ammonium: NH4+).
The reduced quota provides Ammonium in an easily assimilable form from plants and immediately available for their metabolism and at the same time nourishes the nitrifying bacterial flora responsible for the nitrogen cycle, helping to maintain the biological balance of the aquarium.
The part eventually transformed by the bacteria will eventually return to the circulation, remaining at the disposal of the plants as Nitrate.

PhytaGen N1 does not contain any forms of Nitrogen that can create problems for the aquarium ecosystem, such as organic forms such as Urea or Amino Acids.

PhytaGen N1 does not cause accumulations of Potassium in the tank, since the Nitrogen present is not simply balanced / only by Potassium, but rather by a mix of Cations containing Potassium, Calcium and Magnesium in perfectly physiological quantities for aquatic plants.

In this way all the components of PhytaGen N1 are absorbed and used by the plants, without leaving in the tank quantities of residual elements that can alter the ionic balance of the water, favor the accumulation of Potassium and increase the Conductivity.

In order to allow the best development of plants, it is important to highlight how Nitrogen and Phosphorus should always be present in water in a correct reciprocal relationship (see below in the directions of use).
Since however there may be cases of altered balance between these two elements in the tank and consequent need to dose them separately, alxyon has preferred to provide separate nitrogen and phosphorus supplements.


PhytaGen N1 is highly concentrated and contains 33885 mg/l of nitrogen.
For ease of understanding we emphasize that this is the same amount of nitrogen present in 150000 mg/l (150 grams/liter) of nitrates (NO3-).

As mentioned, however, NO3- is not the only source of nitrogen supplied, as this is as follows:

• 31626 mg / l of Nitrate Nitrogen (equivalent to 140000 mg/l of anion Nitrate (NO3-).
• 2270 mg / l of Ammoniacal Nitrogen (from 2920 mg/l of NH4+).
This quantity is equal to that present in 10000 mg/l of NO3-



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Phytagen N1 should be dosed when necessary (ideally once a week); in such amount as to bring/restore nitrate/nitrogen concentration to the set target value.
Taking anyway into account the fact that 1 ml of PhytaGen N1 in 15 liters of water increases nitrate (NO3-) by a quantity equivalent to 10 mg/l (equal to 2.259 mg/l of nitrogen).

Choice of the nitrate/nitrogen target value

The target value for nitrate/nitrogen varies according to the quantity of vegetables present in the tank and their growth rate (influenced by the amount of light, CO2 and other nutrients).

Later we will summarize this parameter with the term "Vegetal Metabolism" (abbreviated as VM) and we will exemplify distinguishing between:

• High VM: high nutrient consumption; due to the presence of many rapidly growing plants.
• Average VM: average nutrient consumption; due to a reasonable presence of plants and/or their average rapid growth
• low VM: low nutrient consumption; due to the presence of a few plants and/or a low growth rate.

Obviously all the intermediate gradations remain possible.
Depending on the aforementioned VM, alxyon recommends that you use the following target values ​​for nitrate:

• High VM: 15 mg/l of nitrate from PhytaGen N1
• Average VM: 10 mg/l of nitrate from PhytaGen N1
• Low VM: 5 mg/l of nitrate from PhytaGen N1

The dosage of PhytaGen N1 must therefore be performed keeping into account the nitrate target chosen for the specific tank (depending on the VM of the same) and carried out with the aim of bringing the concentration of nitrate back to the target previously set.

The dosage must take into account the fact that 1 ml of PhytaGen N1 in 15 liters of water increases nitrate (NO3-) by a quantity equivalent to 10 mg/l (equal to 2.259 mg/l of nitrogen).

In particular, the amount of nitrogen supplied is distributed as follows:
• 9.3 mg / l of ion nitrate (NO3-)
• 0.2 mg / l of ammonium (NH4+).

This part of ammonium is equivalent to 0.7 mg/l of NO3-.

Dosing procedure

In general, it is recommended that the dosage of PhytaGen N1 be taken weekly once the water is changed and after the new water has been introduced.
In this case the dosage procedure is as follows:

• Make the recommended water change (20-25% of the total).

• Re-inject the changed and rebuilt water with PhytaGen S1 Planta salts.

• Wait until the salts have completely dissolved and the water has returned perfectly clear.

• Measure the concentration of nitrate in water.

• Dose the amount of PhytaGen N1 necessary to bring back to the target established according to the VM of the tank.

Once the composition of the tank and the speed of growth of the vegetables have settled, it is possible to assume with a good approximation that the consumption remains constant and the quantity already known can be measured without having to necessarily measure the concentration of the nitrate (which is however recommended ).

By way of example, based on our experience, we report the following possible consumption:

• High VM: 15 mg/l of PhytaGen N1 nitrate per week
• Average VM: 10 mg/l of PhytaGen N1 nitrate per week
• Low VM: 5 mg/l of PhytaGen N1 nitrate per week

Based on these estimated consumption, the dosage can be assumed without the need to measure the nitrate; But, as mentioned, alxyon's recommendation is to proceed as detailed in the points above.

For example:
In general, for an aquarium with a good presence and vegetal growth (medium MV), the dosage is recommended for the first week at a rate of 6.7 ml per 100 liters of aquarium water.
This dose increases the nitrate at 10 mg/l.
From the following week onwards, on the other hand, it will be dosed according to the consumption of the tank; or what is necessary to bring/maintain the concentration of nitrate around 10 mg/l.
In order to obtain the best results it is also very important to dose the nitrogen in a balanced manner compared to the phosphorus (see "Redfield Ratio" in the technical notes).

In particular, a ratio of about 7: 1 between nitrogen and phosphorus should be maintained.
Equivalent also to maintain a weight ratio between nitrate (NO3-) and phosphate (PO43-) of about 10: 1.

Based on this principle PhytaGen N1 should therefore be used in conjunction with PhytaGen P1 according to the respective directions of use. In particular, the combined use of PhytaGen P1 at the same dosage guarantees the combined nitrogen and phosphorus supplementation in the correct N: P ratio of 7: 1 (ratio NO3-: PO43- of 10: 1)

Please find hereafter a dosage calculator to be used on mobile phones.
Just select the relevant product (M1, M2, N1, P1, S1) from the top tabs, insert the data requested and the program will calculate the amount of product to be dosed.

What is the optimal Nitrogen concentration in aquarium?

This question can not have a unequivocal answer.
As we already detailed in the tab regarding the usage, this depends on the plant mass present and its growth rate.

The effect is influenced by various factors, such as nutritional status and light irradiation.

In general, the suggestion is to follow the dosages of nitrate concentrations from about 5 mg/l for a low VM (vegetal metabolism) up to about 15 mg/l for aquaria with a very high VM, and in any case without exceeding 20 mg/l for a single administration.

All of this, always trying to keep a good ratio to Phosphorus, as detailed in the technical notes, regarding the description of the "Redfield Ratio".

Which forms of Nitrogen should be used?

As mentioned, Nitrogen is available in several forms.
Among the most common, we can find:

• Nitrates
• Ammonium
• Urea
• Amino Acids, Peptides, Proteins
• Other ammonium compounds

As said in general, plants prefer Nitrogen in reduced form (Ammonium), since they can use it directly for the internal production of aminoacids and proteins.
By doing so, they do not need to waste energy for converting Nitrates by reducing them to Ammonium.

However, it is not possible to supply Nitrogen to plants exclusively in the form of Ammonium.
This is due to the fact that it is necessary to maintain a correct internal equilibrium, and because a massive dosage in aquarium of ammonia nitrogen would create imbalances and probable algal explosions.

When in the tank there are not only plants, but also delicate aquatic organisms (fish, invertebrates, etc.), the Ammonium can only be supplied in quantities sufficiently low to protect them from any toxicity.

Urea is used as a reduced nitrogen because in water it splits freeing Ammonium.
Because of this it brings with it the toxicity problems related to the administration of Inorganic Ammonium.
Moreover, Urea, in order to be used inside the plants, must also be converted into Ammonium and to do this a nickel-based enzyme is necessary.
At this point the nickel, although required in very low quantities, should be supplied from the outside.

Furthermore, Urea, as an organic compound, provides a major stimulus to algal growth, so it is preferable not to use it in the aquarium.

Considerations analogous to those regarding Urea are valid for the Nitrogen coming from Amino Acids.
Amino acids do not carry the problems related to ammonium / ammonia toxicity but, like Urea, do promote algal growth quite a lot.

As mentioned, PhytaGen N1 provides Nitrogen in the two inorganic oxidized forms, with the oxidized form (Nitrate) to a predominant extent by virtue of its very low toxicity and with a small amount of reduced Nitrogen (Ammonium) such as not to be harmful, in the normal dosage ranges of the product, even to the most delicate organisms, but such as to be a stimulus to the development of the plants and to the nitrifying bacterial flora (from which the stability of the aquarium ecosystem depends intimately).

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