RootMedic Complete is a comprehensive, all-in-one Substrate Fertilizer for Planted Aquariums. Unlike most substrate fertilizers, Complete lasts upwards of 6 months, sometimes as long as 9. Complete is a well balanced substrate nutrient that will enrich inert and nutrient depleted substrates. It is also great for use in tanks that use substrates such as Flourite or Eco-Complete, since their nutrient content is not significant in the long run. RootMedic Complete is a unique formulation of the 12 Macro and Micro nutrients plants need to live. Simply insert the RootMedic capsule into your substrate and with a few days the gelatin capsule will dissolve and your plants will be sucking up the goodness that comes from within! 25 capsules per pack