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How to Install: GLA GRO Aquarium CO2 Regulator How to Install: GLA PRO-DS (Modular) Aquarium CO2 Regulator How to Assemble & Install: GLA DS-Mini (Modular) Aquarium CO2 Regulator How to Install: GLA Modular Manifold Blocks on your GLA Aquarium CO2 Regulator For more CO2 installation and maintenance videos check out our GLA YouTube Channel Expert advice to keep your aquarium CO2 Regulator operating properly when it's time for a CO2 refill: Don’t just remove you …