Description
The ANS OPTI GLASS External Inline Diffuser 12mm is a CO2 system component for planted aquariums.
Key Features
- Essential for providing carbon dioxide to aquatic plants
- Promotes healthy and vigorous plant growth
- Compatible with standard CO2 regulator setups
Inline CO2 diffusion with the ANS Opti Glass 12mm external diffuser
This external inline diffuser plumbs into the 12/16mm outlet hose of a canister filter, so CO2 dissolves inside the line rather than from a glass diffuser sitting in the tank. The payoff for local aquascapers is a clean front pane with no mist and no ceramic disc collecting algae against the glass. Mounted after the canister and before the return, it pushes near-invisible micro-bubbles back into the tank for even distribution across your scape.
It needs adequate working pressure to drive gas through the membrane, so a solenoid regulator capable of a steady rate suits it best. In our warm water where CO2 leaves solution quickly, inline diffusion improves dissolution efficiency and helps you hit a stable green on the drop checker through the photoperiod without cranking the bubble count and risking livestock at night.
Browse the rest of our co2-systems selection for matching regulators and tubing. Compare diffusion approaches in our inline CO2 diffuser guide and reactor vs diffuser decision guide before you commit.

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