Neptune Systems Trident (CAL, ALK, MAG) Monitoring SystemNeptune Systems Trident (CAL, ALK, MAG) Monitoring System Watch this space, our instagram and facebook pages. We will let you know when our Tridents arrive. It is a controlled release situation so be patient, it may take some time. The Trident is an automated testing system that regularly tests alkalinity, calcium, and magnesium in your saltwater aquarium and then communicates this information to your Apex so you can get alerts, and change your