Aquarium Aquatic Root Tabs - Fertilizer.
Aquarium plants require certain nutrients for growth. These root tablets have the necessary nutrients including nitrogen and potassium to help new aquatic plants get off to a vigorous start and keep established plants flourishing. Add one tablet for each 30 square feet of gravel surface. i.e. a 10 gallon aquarium will require 6 tablets. Add new tablets monthly. There are 10 tablets per package.