ANS OPTI GLASS External Inline Diffuser 12mm

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.