PLANTS N: Is a nitrogen fertiliser for all types of aquarium plants in freshwater aquariums. The aquarium nitrogen fertiliser supports the growth of the plants and prevents yellow discoloured leaves due to nitrate deficiency. ADVANTAGES: Our specially developed aquarium plant fertiliser contains nitrate in a biologically available form and is very efficiently absorbed by aquarium plants. It is also free of phosphate. CLEAN AQUARIUM: Unwanted growth of algae is not promoted by the nitrogen fertiliser, because a high density of aquarium plants naturally prevents the growth of algae. APPLICATION: The fertiliser should be used to specifically increase the nitrate content. In doing so, 1ml of plant fertiliser per 100 litres of aquarium water will increase the nitrate content by 1.0mg/L. The optimal nitrate content in freshwater aquariums is 5-10 mg/L. ARKA -: Is one of the world's leading brands in biological water treatment. The products are among the most environmentally friendly on the market - the application is safe and harmless.