A3 Apex Jr Controller System – Neptune Systems



In stock

Certified (#AQ0358037) Department of Agriculture


NEPTUNE SYSTEMS – A3 Jr System-Dry Goods

An Apex monitored aquarium is a successful aquarium! Introducing the exciting all-new A3 Series of Apex controllers. From the Jr. to the Pro, Apex has a solution for every aquarium level. A3 Series Apex Controllers – Monitoring and Control Solutions for every Aquarist!
Ultimate control for any serious control freak. Core control and everyday monitoring. Monitoring for all, control ready.
Our A3 Apex Pro System offers the most complete experience of monitoring and control for the discerning aquarist.
The A3 Apex System offers the control but scaled back monitoring with room to grow for the everyday aquarist.
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 aquarist.


Apex PRO Apex Apex Jr
I want to monitor my aquarium at any time from any device. Check Check Check
I want to monitor critical parameters, like temperature, to protect my tank. Check Check Check
I want to be alerted by text, SMS or email when parameters are out of spec. Check Check Check
I want to know if power of Wi-Fi connection is lost to my aquarium. Check Check Check
I want to be alerted to a possible overflow or leak in or around my aquarium. Check Check Check
I want to be able to automate equipment to respond to parameter changes or emergency situations. Check Check
I want to know that my equipment is operating efficiently and correctly. Check Check
I want to know the relative cleanliness of my aquarium water. Check
I want to remotely check the exact water depth in my sump and reservoir. Check
I want to be able to easily connect other Apex-ready switch boxes and devices. Check
I want to be notified or control action based on water above or below a certain level. Check Check Check

Check Included   Check Sold separately


When possible we recommend the superior reliability of a wired network connection for your Apex or Apex Pro, however when that’s not possible your Apex is perfectly capable connected on WiFi.
So, for this Apex we spent countless man-hours developing an incredible 802.11g/n Wi-Fi connection with reliability that rivals a wired connection.  And, the connection process to your home network is amazingly simple – getting you set up and on the Apex Fusion cloud service in just a couple of minutes!


Apex PRO Apex Apex Jr
Temperature Monitoring Check Check Check
pH Monitoring Check Check Check
ORP Monitoring Check
Salinity Monitoring Probe Available Separately
FMM Input Ports 4 3 2
Controllable Outlets 8 8
1LINK Outputs 3 3
DC 24V Outputs 2 2
Digital Inputs 6 6
Audible Alarm Buzzer Check Check Check
Wi-Fi Check Check Check
Hard-wired Ethernet Check Check
Liquid Level Monitoring Check
Leak Detection Optical Analog Analog
Variable Outputs (0-10V) 4
Optical Sensor Check Check
Expandable Check Check Check
Availability Now Now Soon
Temp 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.


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.
pH 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.
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.
Optical 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

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.

NEPTUNE SYSTEMS – A3 Jr System-Dry Goods

Optical Sensor
Liquid Level Sensor
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 SYSTEMS – A3 Jr System-Dry Goods