Root fertiliser for freshwater aquariums (7 fertiliser balls).Key Features:• Primary care for plant roots: specially produced clay balls, loaded with nutrients, for freshwater aquariums.• Storage capacity for nutrients. No deficiency symptoms: important trace elements such as iron, minerals.• Optimal promotion of plant growth means less algae growth. No phosphates and nitrates.• Strong root formation in plants is a sign of high nutrient absorption through the roots.