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Sera CO2 Tabs are a simple and effective solution for supplying CO2 to your aquarium plants via a CO2 diffusion reactor. Each tablet releases approximately 100 ml of CO2, equivalent to 2,500 counting bubbles, when dissolved in water, ensuring a steady CO2 infusion for plant health. Easy to use, simply place the tablets into the designated slot of the reactor for hassle-free supplementation. With 20 tablets in a pack (90g / 3.1 oz.), these tabs offer a convenient way to maintain vibrant and healthy plants in your aquarium.