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DIY co2 generator. Usually use it for greenhouse plants. But I'm thinking of adapting it for tank use. : r/Aquariums
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CO2 Aquarium DIY CO2 Generator System Kit with Bubble Counter Solenoid Check Valve for Plants Fish Tank Aquarium CO2 Diffuser - AliExpress
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Amazon.com : Aquarium DIY CO2 Generator System Kit CO2 Generator System with Solenoid Valve Bubble Counter Check Bubble Diffuser Carbon Dioxide Reactor Kit for Plants Aquarium : Pet Supplies
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