Aqua Rebell Makro Spezial K View larger

Aqua Rebell Makro Spezial K

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  • Highly concentrated potassium fertiliser
  • Ideal in combination with soil substrates
  • Great choice for aquascaping

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13,90 €

  • 500ml
  • 1000ml
  • 5000ml


In a strongly lit well-planted tank or in aquariums with few fish a lack of macronutrients may occur, which in turn can lead to poor plant growth. Makro Spezial K adds the important macronutrient of potassium to your tank. Your plants can draw on plentiful resources again and will thank you with lush growth.

Weekly water changes of 25% to 50% are recommendable. The dosage can be raised or lowered depending on your requirements. If your tank water already contains a lot of potassium from the start, this fertilizer does not have to be added. It has been designed to prevent the accumulation of large concentrations of macronutrients. If high levels of potassium occur, please reduce the dosage. Makro Spezial K might slightly raise the carbonate hardness in your tank.

The basic supply of macronutrients in a tank with soil-based substrate is provided by our waterplant fertilizers Makro Spezial Licht (nitrate, phosphate and potassium), Makro Spezial K (potassium) and Special N (nitrate). Our waterplant fertilizer Aqua Rebell Makro Spezial K plays a central role in supplying an aquarium with a soil-based substrate with nutrients. The soil substrate contains considerable quantities of nitrogen and phosphorus. Potassium should be supplemented by Makro Spezial K, thus doing away with the nutrient imbalance and giving the waterplants the optimum nutrient supply they need for healthy growth.

When used in high doses, Makro Spezial K can raise the carbonate hardness. However, this is always a sign that the waterplants do not use the potassium you add. If there are no further substances in your tank to raise the carbonate hardness you can safely assume that it is caused by an potassium accumulation, and lower the amount of fertilizer you add.


  • Comes in packages with a volume of 500 ml, 1,000 ml and 5 litres


Dosage per 50 litres
Lots of light (>0.5 Watt per litre) + CO2 1-2 ml per day
Little light (<0.5 Watt per litre) + CO2 1 ml per day
No CO2 supply 1-4 ml per week

This dosage suggestion is just a guideline. The dosage may have to be raised or lowered depending on the conditions in your tank in order to give you good results.

1 ml Makro Spezial K per 50 litres of tank water adds the following nutrients:
K 1.00 mg/l

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