UP Root Planted Aquarium Fertilizer Sticks - 15 Sticks For intensive fertilisation of aquatic plants. Advantage : Contains all plant nutrients, trace elements formulated for long term effectivity Nutrients made available by root absorption Stimulates healthy root growth It's simple and safety for use, do not cloud the water Directions : One stick for 20 litters of water (To increase with density of plants) Brak stick and insert directly into substrate at the roots.