Axis 40 Centrifugal Pump (400GPH) - Aqua Illumination

The Aqua Illumination Axis 40 is a compact centrifugal return pump built around a quiet DC motor and native smart-control support. At roughly 2.4 inches in diameter and 6.6 inches tall, it occupies minimal space in a sump or cabinet while still moving up to 400 GPH against a maximum head of around 9 feet — output well matched to tanks in the 20-to-40-gallon range. Variable power consumption tops out at 20 watts, keeping energy draw proportional to actual demand rather than running at a fixed wattage.

Control integrates directly with AI's ecosystem. The myAI and Mobius apps (iOS and Android) handle scheduling, real-time adjustment, and mode configuration without requiring a separate controller. For reef keepers already running Neptune Apex, the pump pairs with an MXM module to bring Axis into Apex Fusion alongside other system parameters. A single physical button on the pump also allows coordinated feed or maintenance modes across all connected AI pumps simultaneously — useful during water changes or feeding windows when you want every pump to respond to one input.

Three pump modes address the most common operational needs. Schedule mode allows flow to vary over a custom timeline, useful for replicating tidal patterns or adjusting turnover during lights-on versus lights-off periods. Feed mode temporarily reduces flow to keep food in the water column rather than pulling it into the overflow. Calibrate mode sets the pump's maximum, minimum, and neutral flow thresholds relative to your specific plumbing, and once calibrated, the back-siphon prevention logic keeps the impeller spinning at a no-flow state during power interruptions rather than stopping entirely — this prevents air from entering the return line and producing bubbles when the pump resumes.

The Axis 40 ships with two barbed output nozzles (0.625-inch and 0.75-inch) to accommodate common return line tubing sizes, along with a dedicated power supply. Installation is straightforward for any hobbyist familiar with standard sump-based plumbing. For tanks under 20 gallons, the smaller Axis 20 may be a more appropriate fit; for systems above 40 gallons, consider stepping up within the Axis line or pairing multiple units.