Dennerle deponit nutriballs are the universal nutrient depot for all aquarium plants that take in their nutrients predominantly via their rootsr they give new plants a boost to get them started and older plants a new burst of growing powerr simply push 1 4 balls depending on the size of the plant into the area around the roots and replenish every 6 12 monthsr specificationsr nutrient depot for all aquarium plantsr ideal for new plants and for complementary fertilizationr contain