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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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    ATK V2 Auto Top Off Kit

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    The Neptune Systems ATK is a self-contained automatic top-off system engineered to maintain consistent water levels and salinity without requiring ...

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    AquaBus Cable 3Ft (M/M)

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    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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    AquaBus Extension Cable 15Ft Male - Female

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    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 15ft male-to-female connector links your Apex base unit, modules, and E...

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    AquaBus Cable 15Ft (M/M)

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    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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    A3 Apex Jr Aquarium Controller System

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    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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    7.00 pH Calibration Fluid

    13 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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    1/4" Flow Sensor FS25

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    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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    1/2" Flow Sensor FS50

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    The Neptune Systems FS-50 Flow Sensor delivers precise mid-range flow monitoring for your aquarium's critical systems. Measuring between 114–946 L/...

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    Seatorch Electrode Protection

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    Seatorch Electrode Protection Protect the electrode, keep away from water • Flexible disassembly, easy to clean • Extended the length of red tube t...

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    Trident Calibration Solution

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    Keep your Trident calibrated with this Neptune Systems Trident Calibration Solution.

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    Neptune - Optical Sensor with Magnetic Mount

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    This sensor plugs into your FMM and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to we...

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    Neptune - Optical Sensor

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    This sensor plugs into your FMM and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to we...

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    PM2 Module - Conductivity Salinity Port and Temperature Port

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    Consistent salinity is vital for your aquarium’s inhabitants’ well-being.      This module continuously monitors salinity levels, alerting you imme...

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    Neptune - Optical Multi-Surface Leak Sensor Probe

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    New to the leak detector offerings is the Optical Multi Surface Leak Sensor (LD-3). This is a weighted sensor that is an improved sensor and design...

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    Neptune Dose Tubing

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    Neptune Systems genuine Dos Tubing 2 x different sizes 

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    AquaBus Cable 30ft (M/F)

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    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 30-foot M/F cable connects your Apex base unit, modules, and Energy Bar...

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    AquaBus Cable 30ft (M/M)

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    Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 30-foot M/M cable connects your Apex base unit, modules, and Energy Bar...

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    Neptune Apex Breakout Box

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    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

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    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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    Lab Grade Double Junction ORP Probe

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    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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    DDR DOS Dual Reservoir

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    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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    LD-2 Solid Surface Leak Detection Probe

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    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

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    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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    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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