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Page 3 - Neptune Systems Apex

An aquarium controller is one of the most practical upgrades you can make for keeping fish and coral safe. It acts like a 24/7 watchdog for your system, tracking critical conditions and responding fast when something drifts. Instead of discovering a heater stuck on, a pump that stopped, or a leak after the damage is done, Apex can alert you early and automate protective actions to help prevent tank crashes.

The Neptune Systems Apex ecosystem brings monitoring, alerts, and automation into one interface with Apex Fusion. Start simple, then expand into advanced stability tools like automated testing and dosing. If you want the full Apex lineup, explore Neptune Systems Controllers.

Why Do I Need an Aquarium Controller?

  • Early Warnings For Temperature, pH, And More
  • Alerts That Help You Catch Issues Before Livestock Is Impacted
  • Automation That Can Shut Off Equipment Or Trigger Safeguards
  • Power Control And Monitoring Through Energy Bar 832
  • A Platform That Grows With Your Tank Over Time
Best For Most Reefs

A3 Apex Controller System

Neptune Systems Apex Controller System

Strong monitoring and protection with the essentials to start controlling your aquarium with confidence.

  • Includes Temperature + pH Probes
  • Includes MOS Water Level Sensor + LD-2 Leak Sensor
  • A3 Apex Base Unit With 1 pH Port + 1 Temperature Port
  • Energy Bar 832 For Smart Outlet Control + Power Monitoring
Most Complete Monitoring

A3 Apex Pro Controller System

Neptune Systems Apex Pro Controller System

Expanded ports and sensors for deeper visibility, finer control, and more advanced automation headroom.

  • Includes Temperature + pH + ORP Probes
  • Includes LLS Continuous Level Sensor + LD-3 Multi-Surface Leak Sensor
  • Base Unit With 2 pH/ORP Ports + Salinity Port (Probe Sold Separately)
  • Built-In Variable Speed 0–10V Outputs For Added Control Options
Feature A3 Apex A3 Apex Pro
Included Probes Temperature, pH Temperature, pH, ORP
Level And Leak Protection MOS Water Level Sensor, LD-2 Leak Sensor LLS Continuous Level Sensor, LD-3 Multi-Surface Leak Sensor
Probe Ports On Base Unit 1 pH, 1 Temperature 2 pH/ORP, 1 Temperature, 1 Salinity (Probe Sold Separately)
FMM Ports 3 4
Variable Speed Control Not Built In 2 Variable Speed 0–10V Ports (4 Channels)
Power Control Energy Bar 832 Included (Smart Outlet Control + Monitoring)

**Neptune Systems also offers the entry level A3 Apex Jr. Monitoring System that primarily focuses on monitoring critical parameters and water level.

  1. NEW Neptune Systems Sensors to Keep Our Reef Tanks Safe

    NEW Neptune Systems Sensors to Keep Our Reef Tanks Safe

    Three new accessories from Neptune Systems that will help you keep a closer eye on your aquarium.
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  2. Dial in Flow for Saltwater Aquarium Gear Using the Neptune Systems Flow Sensors

    Dial in Flow for Saltwater Aquarium Gear Using the Neptune Systems Flow Sensors

    Accurately measure water flow through your aquarium plumbing using your Neptune Systems Apex aquarium controller.
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  3. Neptune Systems V2 LD-1 & 2 Probes - Protect Your Reef Tank & Home From Leaks!

    Neptune Systems V2 LD-1 & 2 Probes - Protect Your Reef Tank & Home From Leaks!

    Water on the floor from a flood or leaks is the absolute worst nightmare for any aquarist. Let's face it, suspending a glass box full of water, often 100 gallons or more, in your living room is a...
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  4. Add EXTRA Reef Tank Safety With Neptune Systems OS-1 V2 Optical Sensors!

    Add EXTRA Reef Tank Safety With Neptune Systems OS-1 V2 Optical Sensors!

    Customize fluid and water level monitoring using the Neptune System OS-1 Optical Sensor and your Neptune Systems Apex.
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  5. Mount Your Apex with a Neptune Systems Control Board From Adaptive Reef

    Mount Your Apex with a Neptune Systems Control Board From Adaptive Reef

    The perfect solution for mounting your Neptune Systems Apex and keeping all of the wires and cords neatly organized out of view.
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  6. Let Your Apex Take Care of Major Reef Tank Elements With the Neptune Systems Trident!

    Let Your Apex Take Care of Major Reef Tank Elements With the Neptune Systems Trident!

    Automate testing and adjust dosing of your reef aquarium's calcium, alkalinity, and magnesium using the Neptune Systems Trident
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  7. Is the Neptune Systems Apex Worth It?

    Is the Neptune Systems Apex Worth It?

    Gain the peace of mind that your precious reef aquarium is protected, Apex protected.
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  8. What Does the Neptune Systems Apex Do?

    What Does the Neptune Systems Apex Do?

    Find out how a Neptune Systems Apex can turn your aquarium into a smart aquarium.
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Frequently Asked Questions

What can an Apex controller do to protect a reef tank?

Apex can monitor key parameters and sensors, send alerts when something is off, and automate outlet actions to help prevent common failures from turning into livestock losses.

What is the difference between A3 Apex and A3 Apex Pro?

A3 Apex includes temperature and pH monitoring plus MOS level sensing and LD-2 leak detection. A3 Apex Pro adds ORP monitoring, an LLS continuous level sensor, an LD-3 multi-surface leak sensor, more ports on the base unit, and built-in variable speed 0-10V outputs.

Which controller should you choose for a first-time setup?

If you want high-value protection and the essentials to start automating, choose A3 Apex. If you want the most complete monitoring package with ORP, advanced level sensing, and more built-in control options, choose A3 Apex Pro.

Do these systems include power control?

Yes. Both A3 Apex and A3 Apex Pro include an Energy Bar 832, which provides smart outlet control and per-outlet monitoring to help manage equipment and respond to issues.

Can you expand an Apex system later?

Yes. The Apex ecosystem is designed to expand over time with additional modules and accessories so you can add monitoring, automation, and integrations as your tank grows.