Complete Multi-Nutrient with Iron & Iodine for all Planted Aquaria Overview Provides 14 elements critical to long-term health, growth, and coloration of aquatic plants. Elemental ratio reflects current understanding of general requirements for unrestricted growth of tropical aquatic plants. May be used to establish beneficial water parameters in new aquaria, to replenish depleted elemental concentrations in aquaria that rarely receive a water change, and to re-establish concentrations in aquaria following large water changes. Well-suited to the planted aquarium hobbyist seeking one simple solution to use for the majority of plant husbandry requirements (e.g. aside from instances when specific water parameters require adjustment). Also provides 0.001% iodine to enable crustaceans (such as shrimp) to molt and grow. Formulated utilizing extensive research on aquatic plant nutrient requirements.