The store will not work correctly in the case when cookies are disabled.
Bulk Reef Supply Saltwater Logo
Bulk Reef Supply Freshwater Logo

FREE SHIPPING: Dry Goods Orders $49+ & Live Animal Orders $179+

Skip to Content
Menu BRS Freshwater
My Cart
    • My Account
    • My Wish List
    • My Orders
    • Address Book
    • Sign Out
    • Reward Points
  • Sign In
Bulk Reef Supply Mobile Menu
Close

Quick Links

  • DEALS
  • Gift Cards
  • What's New
  • Education
  • Clearance
  • Open Box
  • PR Rewards
  • Shop Brands
  • FAQs
  • Saltwater
Menu
Weekly Deals Weekly Deals
Sign up to be a Reward Member Earn Reward Points
Returns 365-Day Returns
Experts Aquarium Experts
  • Weekly Deals Weekly Deals
  • Sign up to be a Reward Member Earn Reward Points
  • Returns Risk-Free 365 Day Returns
  • Experts Aquarium Experts
Loading...
Skip to the end of the images gallery
main product photo
Skip to the beginning of the images gallery
Neptune Systems

A3 Apex Aquarium Controller System

In stock
Out of stock
SKU
251246
Rating:
77% of 100
6  Reviews Add Your Review
$659.99 $659.99

- +
Add to Wish List
Risk Free 365 Returns

Your Satisfaction Guaranteed With
365 Day Risk Free Returns

No longer need what you ordered? Ordered one too many? We've got your back.


Return new, unopened products in original packaging within 365 days for a full refund.

Under 60 days? No problem. We’ll issue your refund to the original form of payment. Over 60 days? Still no problem. We'll issue your refund in the form of store credit, which you can use like cash on our website.


Return unused, open box products within 30 days.

Open box but still unused? We can help. We’ll issue your refund to the original form of payment minus a small 10% restocking and handling fee.

Some exclusions apply, for more information go to Return & Replacement Details.

Details
 

Overview

 
Neptune Systems A3 Apex

Monitor. Protect. Automate.

The A3 Apex is an aquarium monitoring and control system built to help prevent equipment failures, catch problems early, and make day-to-day reefing less stressful. Track key parameters, control connected devices, and get notified when something needs attention.

Monitoring

  • Track temperature and pH with included lab-grade probes
  • Optical sensor for water level monitoring and leak detection with MOS and LD-2 sensors
  • View trends and history inside the Apex Fusion dashboard

Protection & Alerts

  • Automatically turn outlets on or off based on water parameters, sensors, or even time/day of the week
  • Email and/or push notifications when something needs your attention
  • Built-in audible alarm for immediate local alerts

Control & Expansion

  • Control Neptune Systems equipment like DOS and COR pumps, Trident testers, and more
  • Also compatible with select non-Neptune equipment from top brands like EcoTech Marine, AquaIllumination, Sicce, and Kessil
  • Backwards compatible with legacy Apex modules
 

Inside the A3 Apex

 
A3 Apex Base Unit +
 

The brains of the operation with ports to control the most important water parameters.

  • 3 FMM ports
  • I/O port - 6 switch digital inputs
  • 2 AquaBus ports
  • 1 pH probe port
  • 1 temperature probe port
  • WiFi and Ethernet compatible
  • Built-in audible alarm
Energy Bar 832 +
 

Purpose-built aquarium power control with per-outlet power monitoring, expansion ports, and accessory outputs.

  • ETL/UL certified specifically for aquarium use
  • 8x 120VAC outlets
  • Per-outlet power monitoring (watts/amps) with outlet status indicators
  • 3x 1LINK outputs for WAV, DOS, and more
  • 2x DC24V outputs for accessories (PMUP, solenoids, fans)
  • 3x AquaBus ports for expansion
Magnetic Optical Sensor (MOS) +
 

A low-profile optical sensor that detects water

  • Simple on/off water level detection
  • Use in sumps, ATO reservoirs, AIO tanks, dosing containers, mixing stations
  • Set alerts or actions when level is below or reaches the sensor
LD-2 Leak Sensor +
 

Detects leaks on most flat surfaces.

  • Warning to help prevent damage to your aquarium or home
  • Place next to the aquarium, in the stand, or where ever leaks may occur
  • Weighted to help the sensor stay flat
Temperature & pH Probes+
 

Monitor temperature and pH right out of the box.

  • Includes temperature and pH probes
  • Double-junction pH probe helps maintain stable readings
  • Easy, guided calibration steps in Apex Fusion.
Upgrades & Add-Ons +
 

The Apex ecosystem is designed to grow with your tank. Start with monitoring and control, then add Neptune accessories over time to build a system that matches your goals.

For Example:

  • Add automated testing with the Trident ACM or Trident NP
  • Set up automated dosing or water changes with the DOS QuietDrive
  • Add additional modules to add a salinity or ORP probe
Backwards Compatible +
 

If you already own Apex modules, energy bars, or other compatible accessories, they can work with the A3 Apex controllers.

  • Compatible with both existing and legacy Apex modules and accessories
Apex Fusion Interface+
 

Apex Fusion is a web-based command center for monitoring, alerts, and automation. Customize the dashboard with drag-and-drop tiles and check in from nearly any device.

Set reminders, log testing and dosing information, and keep tabs on your aquarium from anywhere.

  • Web-based interface with dashboards, graphs, and tiles
  • Alerts help you respond to small issues before they become big problems
  • Apex Fusion app is compatible with iOS and Android devices
 

Featured Video

 
 

Specifications

 

A3 Apex Base Unit

FMM Ports 3
Switch Inputs 6
AquaBus Ports 2
Probe Ports 1 pH, 1 Temperature
Networking WiFi & Ethernet
Alarm Built-In Audible Alarm
Dimensions 4.75" L x 3.25" W x 5.25" W

Energy Bar 832

120VAC Outlets 8
1LINK Ports 3
DC24V Accessory Ports 2
AquaBus Ports 3
Certification ETL/UL Certified For Aquarium Use
Dimensions 10" L x 2.25" W x 6.5" H
 

What’s Included

 
 
A3 Apex Base Unit Main brain for monitoring, automation, and alerts
 
Energy Bar 832 Smart power control with per-outlet monitoring
 
LD-2 Leak Detection SensorMonitor for leaks on most flat surfaces
 
Magnetic Optical Sensor (MOS)Low-profile optical sensor for water-level alerts
 
Temperature Probe Track temperature trends and control connected equipment
 
pH Probe Lab-grade double-junction probe for reliable pH readings
Also Included
6′ AquaBus Cable
pH Calibration Solutions (7 & 10)
Mounting Screws
Getting Started Card
More Information
More Information
SKU 251246
UPC 653078004915
Aquarium Type Saltwater, Freshwater
Reviews 33
Write Your Own Review
You're reviewing:A3 Apex Aquarium Controller System
Your Rating
Product Questions

Product Questions

Can you connect a salinity probe to this controller?
Question by: mike on Jan 10, 2024, 11:20 AM
Hey there,
Thank you for reaching out to us. Yes. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Feb 8, 2024, 9:25 AM
Will this run a float switch for the auto top for fresh water and turn the pump on and off
Question by: Timothy Seippel on Nov 3, 2022, 7:22 PM
An Apex can control auto top off that uses a float switch. The easiest option is https://www.bulkreefsupply.com/atk-v2-auto-top-off-kit-neptune-systems.html?queryID=add0423ad9f217c99feb21acf3721099&objectID=9481&indexName=brs_prod_m2_default_products.
Answer by: Scott F. (BRS Staff) on Nov 9, 2022, 12:09 PM
What is the maximum number of modules that this controller will support?
Question by: Tom Wilson on Aug 11, 2022, 1:45 PM
Hey there,
Thank you for reaching out to us. It can have 240 Modules.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Aug 12, 2022, 2:04 PM

SIGN UP TO JOIN THE COMMUNITY & STAY CONNECTED

Our email newsletter is your front-row seat to the best deals, educational videos, new products and more.

Sign Up Now
BRS Fresh https://media2.cdn.bulkreefsupply.com/media/logo/stores/1/BRS-Logo-498x174.png https://fresh.bulkreefsupply.com/
BRS Fresh Bulk Reef Supply
  • Facebook Opens a new window
  • Youtube Opens a new window
  • Instagram Opens a new window
  • TikTok Opens a new window

Contact

  • 763-432-9691

  • 8am - 6pm CT M-Th
    9am - 4pm CT Friday
  • support@bulkreefsupply.com
  • 6325 Sandburg Road, Suite 200
    Golden Valley, MN 55427 US

About Us
About Bulk Reef Supply
Careers
Mr. Chili Sustainability Alliance
Affiliate Program
Terms & Conditions
Customer Center
Contact Us
Preferred Reefer Program
Returns & Replacements
Payment, Pricing & Promos
Shipping & Delivery
Wholesale Customers
APL Star Logo
© 2026 Aperture Pet & Life. All Rights Reserved.
Privacy Policy

item(s) Added to Your Cart

Product Name

View Cart Checkout Now
You may also like
Diamond Black Bio-Substrate (5lbs)
Aqua Natural
Diamond Black Bio-Substrate (5lbs)
$12.99 $12.99

Spring Scissors (5.9 inch)
Fluval
Spring Scissors (5.9 inch)
$23.99 $23.99

Betta Tropical Almond Leaves (10-pack)
Fluval
Betta Tropical Almond Leaves (10-pack)
$9.77 $11.49

Iwagumi Substrate - Colorado Sand (7.7lbs)
Aqua Natural
Iwagumi Substrate - Colorado Sand (7.7lbs)
$15.73 $15.73

BRS Fresh T-Shirt
Bulk Reef Supply
BRS Fresh T-Shirt
From: $22.99

Choose Options
Straight Forceps (10.6 inch)
Fluval
Straight Forceps (10.6 inch)
$13.99 $13.99

Betta World - Mini Lava Rock (1lb)
Aqua Natural
Betta World - Mini Lava Rock (1lb)
$5.59 $5.59

Slateways/Aqua Wild Aquarium Backgrounds
SeaView
Slateways/Aqua Wild Aquarium Backgrounds
From: $5.00

Choose Options
Stainless Steel Curved Spring Scissors
Ultum Nature Systems
Stainless Steel Curved Spring Scissors
From: $29.99

Choose Options
Betta World - Purple Diamond Substrate (1lb)
Aqua Natural
Betta World - Purple Diamond Substrate (1lb)
$5.59 $5.59

Login and Registration Form

  • Login
  • Register

Registered Customers
If you have an account, sign in with your email address.
Forgot Your Password?
or

Login with Your Social Profile Login with

Personal Information
Sign-in Information
Password Strength: No Password
Back
or

Login with Your Social Profile Login with
  • Forgot Your Password?

Please enter your email address below to receive a password reset link.
Go back