Tetra PlantaMin is a monthly intensive iron fertilizer. Thanks to the special depot formula of, the nutrients contained in Tetra PlantaMin stay available for plants over a period of 4 weeks. Iron, potassium, manganese and other essential trace elements provide a lush and healthy plant growth.this is how Tetra PlantaMin works:+ Strengthens plants by guaranteeing a long-term effective nutrient supply+ Prevents sustained yellow, glassy leaves+ Promotes the formation of chlorophyll, thus ensuring rich green leaves+ Prevents iron and potassium deficiencies+ Vigorous plant growth is the best algae prevention+ For the absorption of nutrients through the leaves+ No water pollution as free of phosphate and nitrate+ For all freshwater aquariums+ For intense red and green leaf coloration+ Dosage: add 5ml per 20 litres of aquarium water every month.