Contains nitrogen and phosphor for fast-growing and demanding plants Also contains iron, manganese and vital micro nutrients, Suitable for aquariums with many and fast-growing plants. Specialised Nutrition is added each week when the water is changed. The pump bottle dispenses 2 mL per push. We recommend 6 mL (3 pumps) per 50 L water weekly. However, we recommended that this is set in accordance with plant requirements. Specialised Nutrition contains, in addition to micro-nutrients, all essential macro-nutrients. The fertiliser is particularly suitable where plants display a lack of nutrition. However note that if algae growth starts, Specialised Nutrition will promote this growth.