Neptune Systems Apex A3 Smart Aquarium Controller
The Neptune Systems Apex A3 offers intelligent control with simplified monitoring, designed for the everyday aquarist who wants reliable performance without unnecessary complexity.
| Features | Specifications |
|---|---|
| Base Unit | A3 Apex base unit |
| Ports | 3 FMM Ports, 6 Switch Digital Input, 2 Aquabus Ports, 1 pH/ORP* probe port, 1 Temperature probe port |
| Connectivity | WiFi & Ethernet compatible |
| Alerts | Built-in audible alarm |
| Expandability | Expandable system |
| Monitoring | Track temperature and pH with included lab-grade, double-junction probes; monitor water level with MOS Magnetic Optical Sensor; detect leaks with LD-2 Leak Detection Floor Sensor |
Set reminders, log testing and dosing information, and access data remotely through the companion app.
FAQ
Can the Apex A3 be used with both WiFi and Ethernet connections?
Yes, the Apex A3 is compatible with both WiFi and Ethernet connections.
What sensors are included with the Apex A3?
The Apex A3 comes with lab-grade double-junction pH/ORP and temperature probes, a MOS Magnetic Optical Sensor for water level monitoring, and the LD-2 Leak Detection Floor Sensor.
Is the Apex A3 expandable?
Yes, the Apex A3 is designed to be expandable with additional modules and sensors.

Jake Rutherford –
The Apex A3 has made my aquarium setup much easier to manage. I can now monitor pH and temperature in real time, and the leak detection sensor caught a small water spill early. The audible alarm is helpful when I’m not home. Setup was straightforward and the app provides clear logs of my water testing and dosing.
Gordon Welch –
I appreciate the balance between functionality and simplicity. The built-in probes are accurate, and the water level sensor works well. I haven’t had any false alarms yet. It’s a solid choice for a mid-sized tank.
Jonathan Duncan –
The expandability is a big plus. I’ve added a second digital input for a timer-based dosing system. The WiFi connection is stable, and the app interface is clean and easy to navigate. I’ve been able to track my water parameters consistently over the past month.