Reef Octopus OCTO OS-15A Premium Acrylic Reef Sump
The Reef Octopus OCTO Sump 15 (Model No: OS-15A) is a premium, high-density acrylic filtration basin meticulously designed to bring elite organizational architecture and mechanical efficiency to space-conscious marine reef aquariums. Many small cube setups and nano reef tanks struggle with limited under-cabinet areas, leaving owners to piece together basic plastic storage tubs or custom glass tanks that leak or fail to regulate water depths. The OS-15A bridges this divide, providing a compact 15x15 inch command center crafted from solid machine-cut sheet acrylic that unifies your mechanical, biological, and chemical filtration processes.
Despite its space-conscious footprint, the OS-15A is packed with features designed by hobbyists, for hobbyists. Raw drain water entering the sump routes straight into a specialized bubble-diffusing intake chamber. This compartment features a form-fitting acrylic cover plate that dampens acoustic water noise, stops micro-bubbles from migrating into the display, and controls corrosive under-cabinet salt creep. For mechanical filtration, a built-in 4-inch filter sock seat holds standard media socks for heavy debris capture. Recognizing the trend toward automation, the structural dividers are cut out to accept the Klir Drop-In Automatic 4-Inch Fleece Filter. This gives you the option to bypass manual sock washings entirely for months of hands-free operation.
The center of the sump houses a spacious, dedicated protein skimmer and reactor bay governed by an adjustable weir overflow gate. By loosening two thumbscrews, you can shift the operational water column from 5.1 up to 9 inches deep. This allows you to lock in the exact operational immersion height required by your skimmer's venturi throat, ensuring optimal foam generation without needing to purchase an aftermarket riser shelf. Flanked by an isolated return pump compartment and a built-in 1.5-gallon freshwater top-off reservoir, this robust, hand-fused workhorse serves as a sleek and functional foundation for high-end nano reef systems.
Key Features
Industrial Structural Assembly: Heavy cast acrylic sheets are welded together by hand with seamless solvent joints to avoid warping, structural bowing, or hairline leaks.
Dynamic Skimmer Calibration: Eliminates fixed-baffle restrictions by giving you immediate manual control over the skimmer compartment's working water level.
Integrated ATO Storage: Includes a dedicated 1.5-gallon reservoir with an evaporation lid to keep your automatic top-off supply clean and nearby.
Anti-Siphon Isolation: The return pump chamber sits safely partitioned away from shifting water levels, ensuring stable automated freshwater replenishment.
Polished Finishing Bevels: All exposed edges feature precision machined profiles to prevent finger pinches or wire abrasions during regular equipment scrub-downs.
Equipment Recommendations
Compatible Protein Skimmers: Reef Octopus eSsence S-130, Classic 110SSS, Classic 110-S
Compatible Return Circulation Pumps: Reef Octopus Aquatrance 2000, VarioS 2
Compatible Automatic Mechanical Filters: Klir Fleece Filter Mat Di-4
