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Apex Neptune ATK (Auto Top Off Kit) Version 2


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Apex ATK


The ATK (Automatic Top-off Kit) is a simple, standalone, and complete solution for replacing water lost to evaporation.

The new aquarium hobbyist has many challenges, but none is more annoying than the chore of adding water, every day, to make up for that lost to evaporation (a.k.a. topping off/up).  This alone usually makes the automatic top-off (ATO) device the first piece of automation equipment purchased.

The ironic flip side of this decision is that a faulty ATO device is one of the leading reasons for catastrophic aquarium failure, or even worse, flooding of the house or business.

Not all ATO devices are created equal. Sadly, many ATO on the market are made with cheap components, have very little protection against these catastrophes, and are just a nightmare to assemble and install correctly.

An ATO does not have to be both a blessing and a curse!

We designed our ATK – Automatic Top-Off Kit to not only be super-simple to install and use, but it is unique in the market as an ATO device with three layers of redundant monitoring and water-level control. The ATK does the work for you, while at the same time protecting your tank and your home.

New Improvements for V2

  • New PMUP with improved longevity and reliability

  • Improved optical sensors



  • No More Manual Topping Off

  • Leave Home for Days without Worry

  • Stop Lugging Buckets and Jugs

  • Maintain Consistent Salinity Levels

  • 3 Layers of Disaster Prevention

  • Installs in less than 5 minutes!

  • Standalone or Apex-connected




Plug and play no parts to assemble no wire to attach

3 levels of safety protection

2 optical water level sensor (one for water level one for back up)

IQ water level managment unit will learn how much to top up over time

Back water float to prevent over flow if sensors fail

Does not rely on any fault prone mechanical switches temp sensors or captive sensors

Works stand alone no apex necessary

Advanced features unlocked if used with Apex controller alams, emails and text warning system

Includes apex multi PUMP

Audible alarm

Additional features with optional accessories



1. Backup
Optical Sensor


Should the main water level sensor fail, this second optical sensor is the backup. If water continues past the primary sensor, and then covers this one, the pump will be shut off and an alarm will sound.


2. IQ-Fill – Water run-time intelligence


If both the primary water sensor AND the backup optical sensor fail, the algorithm used in the ATK will not add more than double the learned water amount. It will shut itself off and sound an alarm.


3. Physical float valve – the final backstop


If for some reason all the electronic failsafes do not work, and water is continuing to be sent to the aquarium, the mechanical float valve is the safety device that will stop the water and prevent death to your aquarium and water on your floor.



We are currently taking pre orders on the new ATK V2 stock is expected end of July 2019!




Additional information

Weight3.000 kg


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