Flora Viv Fe is a superior quality, concentrated, bio-available, timed release iron supplement for freshwater planted aquariums. It is designed to begin releasing iron immediately and over days of time. As biological and photolytic reactions occur, Flora Viv Fe dissociates to provide multivalent iron as iron II and iron III. Iron deficiency in plants is often seen as yellowing leaves, particularly starting at the tips, and leaves becoming transparent and eventually disintegrating. Other deficiencies can cause similar symptoms, such as deficiencies in nitrogen, potassium, and magnesium. It is therefore recommended that the hobbyist use Flora Viv first, to provide a wide range of plant nutrients, and then use then use this product to supplement iron as necessary. Flora Viv products contain no dangerous polycycloglutaracetal or glutaraldehyde. Do not overdose this product! Simultaneous use of Bacter Gen F to establish and sustain growth of proper microorganisms and recycle aquarium nutrients will greatly benefit all plants and the aquarium ecosystem. The use of Flora Viv Prolifera will provide additional carbon for heavily planted aquariums. Growth of all photosynthetic organisms also requires strong lighting of proper spectrum. Consult your lighting supplier for assistance in the proper type of light, and photo periods for the plants that you are growing. Be sure to ask lots of questions to get the very best lighting system for your aquarium.