Brightwell Aquatics "Florin Multi, Complete Multi-Nutrient with Iron and Iodide for All Planted Aquaria, 2 L Provides 14 elements critical to long-term health, growth, and coloration of aquatic plants. May be used to establish beneficial water parameters in new aquaria Well-suited to the planted aquarium hobbyist seeking one simple solution to use for the majority of plant husbandry requirements. Also provides 0.001% iodine to enable crustaceans (such as shrimp) to molt and grow. Formulated utilizing extensive research on aquatic plant nutrient requirements.