Plant Pack Fundamentals is an excellent pack for beginning aquatic gardeners. It contains Flourish, Flourish Iron, Flourish Excel.Flourish is a growth stimulator for aquarium plant stems and leaves. It contains a broad spectrum of essential trace elements, vitamins, and amino acids. Flourish is rich in gluconate iron, manganese, calcium, magnesium, potassium, inositol, choline B12, biotin, and other factors that have been determined to be beneficial to aquatic plants.Flourish Iron is a companion product to Flourish and Flourish Tabs. It is a complexed ferrous (Fe Plus 2) iron product which contains 10,000 mg/L of iron and is ideal for iron maintenance in the natural planted aquarium. Plants can utilize both ferric (Fe Plus 3) and ferrous (Fe Plus 2) iron, although they prefer ferrous iron when available. Flourish Excel is a simple source of readily available organic carbon. All plants require a source of carbon. This is typically obtained from CO2, but, may also be obtained via relatively simple organic compounds (such as photosynthetic intermediates). Since both processes occur simultaneously one can derive a substantial benefit with the use of Flourish Excel either alone or in conjunction with CO2 injection.