CO2 Scrubber Skimmer Lid 4" (C2C-120)

The Reef Octopus CO2 Scrubber Skimmer Lid 4" (C2C-120) replaces your skimmer's standard vented lid with a sealed port that routes intake air through a CO2 scrubber canister instead of pulling straight from room air. This matters most in enclosed fish rooms, basements, or bedrooms where elevated indoor CO2 can suppress tank pH even with a well-tuned skimmer running. Fits: Reef Octopus skimmers with a 4-inch (120-size) neck Use: connects to a CO2 scrubber canister (media sold separately) to feed scrubbed air to the skimmer's air intake If your pH reads noticeably lower than expected despite good alkalinity and skimmer performance, high ambient room CO2 — not the tank chemistry — is often the culprit, and this lid is the fix. Compatible with: Reef Octopus skimmers using a 4-inch (120-size) neck and lid.