CrystalClear Thrive is designed to keep your aquatic plants vigorous and beautiful. CrystalClear Thrive tablets will feed potted aquatic plants all season long. Simply use one tablet for every gallon of soil each month during the growing season. Push the tablet one finger deep into the soil, 3″ from the crown of the plant. Press soil around the inserted tablet for best results. It is always a good idea to feed plants every two weeks when the water temperature rises above 75°F.