The 250 ml container of Seachem Flourish Advance is a natural phytohormone supplement for sensitive planted aquariums, packed with beneficial minerals and nutrients that are necessary to regulate and enhance explosive and eye-popping plant growth. This growth enhancer boosts mineral absorption allowing your plants to battle harsher diseases and dramatically stimulate the growth of roots and shoots. Phytohormones are naturally occurring compounds that are essential in regulating developmental processes such as cell division, formation and the activity of shoot meristems, induction of photosynthesis gene expression, leaf senescence, nutrient mobilization, seed germination, root growth and stress response. All of these processes contribute to healthy, long lasting aquatic plants. For the best results, Seachem Flourish Advance should be used on a regular basis to ensure that plants are properly absorbing the wide variety essential nutrients inside of the aquarium. After approximately 10-14 days of steady use, root growth will begin beneath the surface of the substrate, followed by significantly enhanced development on both leaves and stems. It is completely safe for fish and invertebrates.