Tropica Specialised Fertiliser contains nitrate, ammonium, phosphate, iron, manganese, and other vital micro-nutrients required to ensure healthy and active plant growth. It is ideal for use in heavily planted aquariums, aquariums containing fast-growing plants, and with plants showing signs of malnutrition. Specialised Fertiliser is easily and precisely dosed with its convenient pump-top applicator. A minimum 25% of the aquarium water should be changed weekly when dosing this product. This reduces nutrient concentrations in the water, and also removes algae spores and other accumulated elements. 125 ml bottle treats up to 264 gallons.