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Neptune A3 APEX Jr Aquarium Controller System


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Neptune A3 Apex Jr

Monitoring for all, control ready. The A3 Apex Jr. is the first monitoring only solution that monitors exactly what you need; and, when ready, opens the door to control for all aquarists.

Setup has never been easier

From the moment you open the box you are guided along every step of the way from what is in the box, getting connected to your network and setting up the monitoring and control of your aquarium.

Cloud-based control

Apex Fusion is the Apex Aqua Controller command center. Apex Fusion is cloud based and accessible on nearly every device platform (web browser, iOS, Android etc.) from anywhere in the world. Fusion’s easy to use dashboard allows you to adjust equipment settings , track parameter changes and create automated aquarium actions and programs.

Easy to use and extremely powerful Apex Fusion will take your aquarium success to the next level.

25 Years of Monitoring

Tens of thousands of aquariums. Billions of measurements a year. Near zero downtime. Neptune Systems has been helping aquarists monitor their marine ecosystems for 25 years. In an aquarium, parameters can change in the blink of an eye. Apex provides 24/7 monitoring of your aquarium to help fine-tune the stability your fish and corals need to thrive while alerting you to any changes that might negatively impact their ability to survive.

Successfully Monitored By Apex

If it’s important to your aquarium’s safety and success Neptune Systems wants to help you monitor it. Apex offers a large selection of sensors, modules, and accessories to monitor not only what is happening in your aquarium, but also outside your aquarium. From Mg, Ca, and Ak to water on the floor (leaks) and even power outages Apex has a solution


Whats included

neptune temperature probe

Temperature Probe

Keeping a stable and consistent temperature in the aquarium is paramount to the health of your inhabitants. Monitoring temperature and especially temperature changes throughout the day is mission critical.

Having a quality temperature monitoring solution that also alerts you to over or under temperature situations is a must for a successful aquarium.

neptune ph probe

pH Probe

Keeping pH stable is critically important to healthy coral in a reef aquarium. A stable pH is also less stressful for all the aquarium’s inhabitants.

Monitoring pH not only allows you to tune in desirable parameter stability but also serves as an important warning system to warn you of negative chemistry changes.

neptune apex solid surface leak detection probe

Solid Surface Leak Sensor

When it comes to water on the floor, time is critical. Upon contact with liquid this sensor will communicate to your Apex to send an alert or trigger other actions.

With a wire length of 5 meters (16.3ft) this sensor is a must have for placement inside and outside of your sump.

Protect your aquarium and your home

neptune systems optical sensor

Optical Sensor

Think smart float switch. The optical sensor indicates the presence of water above or below the sensor location.

The Magnetic Optical Sensor features an improved look and feel. The sealed housing and magnetic mounting design prevent water incursion and make mounting quick and easy.

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