Aquarium Fertilizer | Ferrum Liquid Iron 500ml Bottle | NilocG Aquatics | Highly Concentrated Iron Supplement for Planted Tanks Ferrum- Liquid Iron Supplement Concentrated 10,000mg/l source of available iron Provides 0.25ppm Iron when dosed at 1(1ml) pump per 10g Derived from Iron Chelate DTPA, Iron Chelate EDTA and Ferrous Gluconate Treats 5000 gallons