JBL ProScape Mg Macroelements

JBL ProScape Mg Macroelements

  • Magnesium is essential for the chlorophyll production
  • Recommended level: 5 - 10 mg/l
  • The dosage can be checked with the JBL magnesium test
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Healthy plant growth is based on the following three main pillars: A supply of light, a supply of CO2 and an adequate/optimal supply of mineral nutrients. The supply of nutrients is described by Liebig’s Law of the Minimum. According to this concept, the nutrient which is available in the minimum amount limits the growth of plants regardless of whether it is a microelement or a macroelement. Microelements are trace elements which plants need in small amounts, whereas macroelements are used for growth in larger amounts.

In a well-planted aquarium, both microelements and macroelements are consumed in large amounts. Particularly when the fish population is small, the microelements, as well as the macroelements of nitrogen, phosphorous and potassium, quickly drop down to the minimum.

The macroelements can easily be supplied by using JBL ProScape NPK Macroelements or by adding each of the individual components, nitrogen, phosphorous, potassium and magnesium, separately. If the latter procedure is selected, it is recommended to check the water values with the JBL Test Set each time.

As the central atom of chlorophyll, magnesium plays the decisive role in photosynthesis, and in the plant’s energy production from light as a result. Magnesium also carries out other important functions in the regulation of enzyme activity and other metabolic processes in the cells. The concentrations of magnesium in the drinking waters usually used in aquariums vary considerably, depending on the water supplier. It is advisable to determine the current magnesium concentration of the water with the JBL Mg Test Set in order to find the right dosage of the JBL ProScape Mg Macroelements fertiliser.

JBL ProScape Mg Macroelements supplies tank water with magnesium in the form of water-soluble magnesium salts. As a result, the aquatic plants obtain the supply of magnesium they require.


  • Magnesium is important for the development of the green leaf pigment of the plants.
  • Standard dosage in aquariums with CO2 fertilization and a lot of light: 5 ml/100 l.
  • Recommended level: 5 – 10 mg/l.
  • The dosage can be checked with the JBL magnesium test for freshwater.
  • Contains a 2 ml dispenser.


Dosage per 100 Liter
Well lit tank (1 Watt per Liter) + CO2 6 ml daily
Without CO2 2 ml per week

The normal dosage is 5 ml / 100 l of water for a very well-lit tank with >= 1 W / l of illumination and 2.5 ml/100 l of water for a tank that is not as well lit. The supply of carbon dioxide must also be considered.

The above table shows recommended fertiliser concentrations according to the general conditions of the aquarium.

As actual precise consumption cannot be predicted, we recommend regularly checking the magnesium concentration with the JBL Mg Test Set, especially prior to each follow-up dose.

5 ml JBL – ProScape Mg Macroelements in 100 l yelds a concentration of:
Mg 0,625 mg/l



JBL is a traditional German company with a very wide range of products for aquarists. From high-quality fish and shrimp food to external filters and water plant fertiliser, JBL offers a wide selection for aquarium enthusiasts.

JBL's research and development constantly brings new, innovative products onto the market. Whether aquascape, fish aquarium, shrimp tank with a scurry factor or a pure water plant aquarium in Holland style, JBL offers suitable aids for set-up and maintenance for all these directions.

General information

Item no.
EAN 4014162211224
Weight 0,38 kg
Shipping weight 0,50 kg

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