ReefH2O Brightwell Aquatics Florin Fe - Bioavailable Ferrous & Ferric Iron Source for Planted AquariumsHelps improve red coloration of leaves in aquatic plants Helps correct iron deficiencies which cause yellowing, transparency, and death of aquatic plants Two tiered approach to iron supplementation (provides both ferrous (Fe2+) and ferric (Fe3+) iron): consists of one ingredient to deliver immediate iron and another ingredient that slowly releases iron during daylight, maximizing benefits to plants Over 50% stronger than most competing products; Made