Provides Humic Substances for all Planted & Blackwater Biotope AquariaOverview Establishes similar water conditions to those found in black water rivers, many of whichare home to important aquarium fishes and plants. May be used to help simulate the onset of the rainy season for encouragement offish spawning. Provides humic substances (humic and fulvic acid), complex bio-organic moleculesknown to increase the availability of important nutrients (such as iron, calcium,magnesium, molybdenum, copper, manganese, zinc, cobalt, and nickel) to plants,potentially enhancing the effectiveness of plant nutrient solutions in aquaria. Formulated utilizing extensive research on aquatic plant nutrient requirements andriverine water chemistry. Brightwell BFA Item # Blackwater Extract 500 mL BR01174