Nutrient substrate for beautiful long-lasting plant growth in freshwater aquariums. Guaranteed action for 5 years.Nutrient reservoir: contains essential plant nutrients like iron. Nutrient reservoir: contains essential plant nutrients such as iron. Clay components store nutrients and release them later when needed.Effectively prevents unwanted algae growth by stimulating plant growth.Use for new tank: place nutrient substrate and cover with a layer of washed soil substrate.Included in delivery: 1 bag of ready-to-use long-lasting nutrient substrate for aquarium plants