I finally decided to hook up my Apex Breakout Box with some float switches to automate my auto top off with my Apex Aquacontroller system. I purchased the following items from Marine Depot:
The installation was simple and very straight forward. Connect the float switches to the mounts and wire them to the Breakout Box. For hobbyists using the Reefkeeper system, all you need to do is plug the molex included with the float switch kit into the SL1 module.
Once everything was wired, the setup on the Apex controller was rather simple as the breakout box is not a Aquabus module, so there is no setup or configurations to worry about. All I needed to do was add a simple IF statement to the outlet programming to switch on the water pump when the float is triggered.
The main advantage of using float switches on your aquarium controllers versus standalone auto top off systems is the flexibility of setting up multiple backup float switches, email alerts, and alarms. I plan on buying a third float switch so it can send email alerts and shut off the water pump if the primary float gets stuck in the ON position.