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Stable reefs don't happen by accident. The equipment and supplements that keep yours thriving through winter. Shop Winter essentials →
Stable reefs don't happen by accident. The equipment and supplements that keep yours thriving through winter. Shop Winter essentials →

Neptune Systems

Precision Monitoring & Automation for Serious Reef keepers
Explore our full range of Neptune Systems gear—built for accuracy, control, and peace of mind. From the powerful Apex Controller and Trident water testing system to flow meters, probes, and leak detectors, Neptune’s modular components give you the tools to automate and monitor every part of your reef tank. Perfect for both new setups and long-term reef maintenance.

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    1" Flow Sensor FS100

    Only 2 left!

    The Neptune Systems FS-100 Flow Sensor delivers real-time flow monitoring for high-capacity aquarium systems up to 5,678 L/h. Engineered for 1" sli...

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    $149.90 - $149.90
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    Neptune Apex Breakout Box

    Only 1 left!

    I/O Breakout Box When connected to the I/O Port of your Apex, Apex EL, ASM or PMx module, the Breakout Box gives you an easy way to connect up to s...

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    DOS Replacement Tubing

    Only 2 left!

    Compatible with Neptune Systems DOS dosing pumps, this replacement tubing extends your fluid delivery lines with reliable performance. Use it to r...

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  • $229.90 - $229.90
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    Lab Grade Double Junction pH Probe

    Only 2 left!

    Neptune Systems' Double Junction pH Probe combines laboratory-grade precision with extended durability for demanding reef aquariums. The dual-chamb...

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    Lab Grade Double Junction ORP Probe

    Only 2 left!

    Neptune Systems Double Junction ORP Probe Reliable, Long-Lasting ORP Monitoring for Reef Systems Overview The Double Junction ORP Probe from Neptu...

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  • $499.90 - $499.90
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    DDR DOS Dual Reservoir

    Only 2 left!

    Neptune Systems DDR – DOS Dual Reservoir The DDR is a dual-reservoir storage system engineered for Neptune DOS dosing setups. With two 2-litre cham...

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    $499.90 - $499.90
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  • $79.90 - $79.90
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    LD-2 Solid Surface Leak Detection Probe

    Only 1 left!

    Neptune Systems LD-2 Leak Detection Probe safeguards your aquarium investment by identifying water leaks, overflows, and spills before they cause d...

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    LD-1 Low Profile Leak Detection Probe

    Only 1 left!

    Neptune Systems LD-1 Leak Detection Probe – a slim, low-profile sensor engineered for tight spaces where standard detectors won't fit. Designed to ...

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    $79.90 - $79.90
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  • $679.90 - $679.90
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    COR-15 Intelligent Return Pump (1500 GPH)

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    The COR-15 is a next-generation return pump engineered for aquarists who demand precision control and reliability. Delivering up to 1500 GPH, this ...

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    $679.90 - $679.90
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    AquaBus Cable 6Ft (M/M)

    Only 2 left!

    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 6-foot M/M cable connects your Apex base unit to compatible modules and ...

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    AquaBus Cable 3Ft (M/M)

    Only 1 left!

    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 3-foot M/M cable connects your Apex base unit, modules, and Energy Bars...

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  • $59.90 - $59.90
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    AquaBus Cable 15Ft (M/M)

    Only 1 left!

    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 15-foot M/M cable connects your Apex base unit, modules, and Energy Bar...

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    AquaBus Cable 1Ft (M/M)

    Only 2 left!

    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 1-foot interconnect cable links your Apex base unit, modules, and Energ...

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  • $629.90 - $629.90
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    A3 Apex Jr Aquarium Controller System

    Only 2 left!

    The A3 Apex Jr transforms aquarium management by automating the monitoring tasks that keep your reef thriving. This entry-level controller tracks t...

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  • $9.90 - $9.90
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    7.00 pH Calibration Fluid

    15 in stock

    Neptune Systems pH 7.00 Calibration Solution – Single Use Packet Keep your pH probe readings accurate with this single-use calibration packet. pH ...

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  • $99.90 - $99.90
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    4 Inch LLS Liquid Level Sensor

    Only 1 left!

    Neptune Systems LLS – Liquid Level Sensor delivers continuous, precise water depth monitoring for advanced aquarium automation. Unlike traditional ...

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  • $219.90 - $219.90
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    35 Inch LLS Liquid Level Sensor

    Only 1 left!

    Neptune Systems LLS – Liquid Level Sensor delivers continuous, precision water level monitoring for advanced aquarium automation. Unlike traditiona...

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  • $249.90 - $249.90
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    2" Flow Sensor FS200

    Only 1 left!

    Neptune Systems FS-200 Flow Sensor – 2" Slip PVC Monitor high-volume water movement with precision. The FS-200 is Neptune Systems' largest flow sen...

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    $249.90 - $249.90
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  • $9.90 - $9.90
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    10.00 pH Calibration Fluid

    15 in stock

    Neptune Systems pH 10.00 Calibration Solution – Single Use Packet Maintain accurate pH readings across your aquarium's full range with this high-p...

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    $9.90 - $9.90
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  • $49.90 - $49.90
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    1/4" Flow Sensor FS25

    Only 1 left!

    Neptune Systems FS-25 Flow Sensor – Precision Flow Monitoring for Your Apex System Track water movement with confidence using this compact ¼" flow ...

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