The A3 Apex is the controller that sits above the lights, pumps and CO2: it monitors pH, temperature, salinity and ORP, schedules dosing pumps and auto top-off, and logs everything to a dashboard you can read from anywhere. More usefully, it can cut power to a heater, pump or skimmer when a probe reads something dangerous, which is the fail-safe a reef tank actually needs. It expands with additional modules as a tank grows. For anyone running a mixed reef this is the layer that keeps the rest of the equipment honest.
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