Aquarium plants are mostly fertilised with liquid fertilisers. In them, all the important nutrients are dissolved in water and can be added to the tank easily with the help of a dispensing aid.
A sufficient supply of macronutrients is especially important for lush growth in aquatic plants. Nitrate (NO3), phosphate (PO4) and potassium (K+) are the most crucial water plant nutrients. Aqua Rebell has single component fertilisers that add nitrate, phosphate or potassium, and also NPK fertilisers like Aqua Rebell Makro Basic NPK or Makro Basic Estimative Index, which add nitrate, phosphate and potassium combined. Calcium and magnesium belong to the macronutrients, too, however, tap water usually contains sufficient amounts of these elements. Micronutrient fertilisers like e.g. Mikro Basic Eisenvolldünger (complete iron fertiliser) or Mikro Spezial Flowgrow preliminarily add iron and manganese. Boron, molybdenum, zinc and copper are also contained in these micronutrient fertilisers in order to provide your plants with everything they need for vital and continuous growth.
If you choose liquid fertilisers for supplying your aquatic plants with nutrients, you won't need additional fertilising substrates as a rule. It is possible to supply aquatic plants with all the nutrients they need through the water. However, a substrate rich in nutrients (like soil) can be considered helpful at all times.