CrystalClear Thrive slow release tablets will feed potted aquatic plants all season long, keeping them vigorous and beautiful. Simply use one tablet for every gallon of soil each month during the growing season. Push one tablet one finger deep into the soil, 3 inches 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 degrees F.