Octo CR-140 Classic Calcium Reactor

Reef Octopus Classic CR-140 Calcium Reactor

The Reef Octopus Classic CR-140 (SKU: OCT-CR140) is an automated, highly efficient aragonite-dissolving reactor system designed to stabilize and supplement calcium, alkalinity, and essential trace elements in marine reef aquariums up to 200 gallons. Maintaining optimal ionic balance manually becomes a grueling task as hard stony corals (SPS and LPS) mature and expand. The CR-140 replaces the volatility of multi-part daily liquid dosing by using pressurized carbon dioxide (CO2​) to safely drop the internal chamber pH, melting crushed ancient coral skeletons back into their raw, bio-available mineral states.

Constructed from premium, heavy-duty cast acrylic, the CR-140 relies on an advanced reverse-flow fluid layout. The integrated Aquatrance 2000 recirculation pump continuously pushes acidic water from the bottom of the 5.5-inch chamber upward. This configuration ensures that the CO2​ gas remains completely dissolved and distributed, maximizing contact time with the aragonite media while preventing the substrate from packing together into a solid brick. Complete with a modular screw-off lid, a functional bubble counter, and an integrated probe holder, this compact workhorse is the definitive upgrade for low-maintenance coral growth.

Key Features

• Automated Skeletal Supplementation: Provides balanced ratios of calcium, carbonate hardness, strontium, and magnesium simultaneously.

• Aquatrance 2000 Recirculation: Keeps the internal water loop moving consistently to eliminate dead zones inside the media column.

• Recirculating CO2​ Geometry: Recycles unused gas pockets trapped inside the upper neck, minimizing overall CO2​ bottle consumption.

• Probe Integration Ready: Port allows a standalone pH monitor or controller probe to monitor internal levels without risking leaks.

• Effortless Plumbing Taps: Employs industrial-grade 1/4-inch push-connect fittings for precise incoming feed and outgoing effluent tracking.

Demand Handling

• Heavy Demand: 100 Gallons

• Medium Demand: 150 Gallons

• Light Demand: 200 Gallons