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Neptune A3 APEX Pro Aquarium Controller System


In Stock

Neptune A3 Apex Pro

Ultimate control for any serious control freak. The A3 Apex Pro System offers the most complete experience of monitoring and control for the discerning aquarist.

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 orp probe

ORP Probe

Oxidation Reduction Potential (ORP) is the measurement of water cleanliness. ORP level indirectly indicates the ability of beneficial bacteria in the aquarium to reduce contaminants like nitrates, ammonia ECT. Ultimately it is in part a measure of the electrical charge available to break down these contaminants.

Sudden changes in ORP are often reflective of organically bad things happening the aquarium. If a fish passes or too much food is available, the change in ORP can prove to be a much needed signal to investigate or take action.

neptune optical leak sensor

Optical Leak Sensor

The Optical Multi Surface Leak Sensor is an improved version of the Solid-Surface Leak Sensor (LD-2).

Improvements include an epoxied design that allows the sensor to be utilized repeatedly and an optical sensor that allows the sensor to be placed on any surface including metal and epoxied cement floors without returning a false activation.

neptune liquid level sensor lls

Liquid Level Sensor (LLS)

How much water has been added? How much solution is left? Until now the only way to find out was to measure it yourself.

New to aquarists, and exclusive to Apex, is the ability to specifically measure water depth in inches or centimeters. Available in four different sizes- 4″, 15″ 23″ and 35″ there is a perfect length for water level monitoring in, aquariums, reservoirs, and liquid containers.

Take level monitoring to the next level with the LSS.

Neptune EB832


When Neptune decided to create an Energy Bar for this new Apex,  they designed it from the ground up.  Not only does the Energy Bar 832 have eight 120V AC outlets, but it includes an internal 100W 24VDC power supply as well. That power supply feeds three built-in 1LINK ports as well as two 24VDC accessory ports.

And, each individual outlet has independent power monitoring and there are individual LED indicators for each outlet.

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