Nutrient salts are an easy, reasonably-priced variant with which you can mix your own aquatic plant fertiliser or for adding the salts directly to your tank. Nutrient salts contain nitrogen (as urea), phosphate or potassium. Epsom salt (magnesium sulphate) can be used to harden the water or to prevent magnesium deficiencies.
Specifically developed iron chelates supply the aquatic plants with all the iron they need.
With these nutrients, your aquatic plants can draw on plentiful resources, which will result in lush growth.