Features:1.Important for fish breeding as well, better living condition will offer your fish a healthier living space.2.Increase CO2 content of fish tank, which will improve photosynthesis efficiency and plants growing better.3.Place on different position in your fish tank, quick solution for your plants, easy to absorb, safe and no harm.4.Simply drop the CO2 tablet into the aquarium water will do the job.Use one tablet for 20L water, once or twice a week.5.Easy and convenient way to provide CO2 for your aquarium plants to thrive. Put the tablet into CO2 atomizer can get better effect.Specifications:Item Type: CO2 TabletMaterial: CO2 TabletSize : 7*7*7cm/2.8*2.8*2.8inchPackage List:1* Bottle of CO2 Tablet.