Are you looking to enhance the growth of your aquatic plants? These Ista CO2 Tablets are the perfect solution for achieving a lush, robust planted aquarium! These tablets are a great CO2 supplement option, that is easy-to-use and extremely convenient. Simply add one tablet per 5.3 US gallons (20 litres) and watch it gradually dissolve, adding 5 mg/L of CO2 to your water!