Neptune COR-20 DC Return Pump. Up to 2000gph

  • $566.99
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Your return pump is by far the most important piece of equipment on your aquarium. It circulates the water which is basically the life-blood of a tank. Creating a great aquarium is just like building a great body – it all starts at the core – and this is precisely how our pump got its name! The COR is a variable speed, brushless, DC-driven centrifugal water pump designed specifically for aquariums to be intelligent, energy-efficient, unbelievably quiet, and incredibly powerful for its size.


That’s right, the COR-20 will run completely standalone OR connected to ANY Apex System via its AquaBus port. If you don’t yet have an Apex, don’t worry, down the road when you get one, you’ll open the door to many more features (like mobile notifications).

UP TO 2000 GPH (7500 LPH) When properly plumbed, one COR-20 provides enough flow for aquariums up to 180 gallons. For larger systems, use two COR-20 for redundancy and disaster prevention. COMPATIBLE WITH ALL APEX SYSTEMS The COR pumps are compatible with all Apex systems including: Apex, Apex Classic, Apex Lite, and Apex Jr. Simply connect the COR driver to the Apex via any available AquaBus port.

FOR INTERNAL OR EXTERNAL APPLICATIONS With it’s included fittings, the COR-20 can be plumbed to work either externally, or submerged in a sump.

IQ-LEVEL SETS THE PROPER MIN AND MAX FOR YOUR AQUARIUM Every aquarium is different so the IQ-Level feature of the COR-20 enables you to set a customized minimum and maximum flow rate for your specific aquarium’s needs.

If power should go off, when it restarts it will always return to that memorized setting. Also, during feed modes, your water will not completely back-siphon. This prevents the burping and bubbling that normally occurs when a pump powers back up. INCLUDES OVERSIZED 1.25 in. UNION We include a 1.25″ BSPP -> 1.25″ Slip PVC Unions so that you get the optimal flow from your COR-20. Plumb your system with 1.25″ and see what this pump can really do!


The COR-20 is a brushless, DC-driven pump optimized for the lowest power consumption possible.

At 100% it still uses less than 90W at the wall! INCREDIBLY QUIET! We think the COR-20 is the quietest pump on the market for its size and output. The COR uses the latest in Vector Control, BLDC motor technology. This drives the COR pump in a way that is both energy efficient as well as nearly vibration and noise free. We challenge you to find a quieter pump!

ADVANCED CONTROLABILITY While an Apex connection is not required, the COR was built from the ground up with Apex controllability in mind. Connect the COR to the Apex and control your pump output percentage, get real-time operational feedback from the pump, integrate it into complex feed routines, and monitor the status of the pump from anywhere in the world via Apex Fusion.

OBSTRUCTION DETECTION Snails, filter pads, or other foreign objects often find their way into a pump. Should the intake to your COR or any of your plumbing become significantly obstructed, the COR will alert you by flashing the LED on the driver.

When the COR is connected to an Apex and the internet, it will send an alert to your mobile device as well.

INTERNAL TEMPERATURE MONITORING The pump driver is continually monitoring the internal temperature of the COR pump motor. If it reaches an unsafe level, the driver will slow the pump down just enough to bring the temperature into an acceptable range while also providing you a notification. Some pumps shut off completely when they have a temperature issue, but the COR slows down so your tank will continue to circulate — giving you time to address the problem. FEED MODE With a few button presses (standalone mode) or some simple configuration in Apex Fusion, you can set a Feed Mode that will slow the pump to any level you choose.

When connected to an Apex, you can even have other tank operations sequence with this feed mode and the time interval of the Feed Mode can be customized as well. When connected to an Apex, the buttons on the COR driver also function as an easy to use feed button. INCLUDED FITTINGS The COR comes complete with all the fittings necessary for most aquarium configurations (0.75″ output, 1.0″ input). But we’ve also included a 1.25” union for the output so you can connect the pump in a manner that will result in the least amount of head loss. Plumb your main return-line in 1.25″ and get the full potential of the COR pump – as much as 50% or more flow!

INCLUDES: COR Pump COR-20 Pump Driver 100W 24VDC Power Supply Power Cord 1.25in. PVC Union (Slip->BSPP) 1.0in. Slip Fitting 0.75in. Slip Fitting 3-foot AquaBus Cable


PUMP: 3.875”W xv4.875”H x 6.250”D DRIVER: 3″W x 4″H x 1″D