tropica specialised fertiliser - 300 ml tropica tropica specialised fertiliser contains all essential nutrients needed including nitrogen (n) and phosphorus (p). specialised fertiliser is suitable for aquariums with many plants in relation to the number of fish, where plants can lack nitrogen (n) and phosphorus (p) which otherwise would be supplied by fish excrement and food remnants. specialised fertiliser is composed so that n and p in particular are supplied to the plants in the amounts and chemical forms the plants require for optimal absorption and growth. the waterplant fertilizer has been developed for plants which easily absorb nutrients from the water via the leaves, which typically are the low, compact foreground plants. the fertilizer also contributes to the supply of the nutrition large stem and rosette plants require. specialised fertiliser is added each week when the water is changed. we recommend 5 ml per 50 l water. however, we recommended that this is set in accordance with plant requirements. specialised fertiliser