JBL Pro Flora 7 Balls (fertilizer)Root fertiliser for freshwater aquariums (7 Kugeln fertiliser balls), lasting up to 180 days. 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