The HYDROS Control X4 by CoralVue is a flagship all-in-one aquarium controller and automation hub. A single X4 monitors temperature, pH, ORP, and water level while controlling pumps, timers, level sensors, and more — no extra expensive modules required. Built for saltwater aquariums, freshwater tanks, and even pond applications, it's the most capable controller in the standard HYDROS lineup. Key features Two Probe Ports — monitor pH and ORP with accurate, reliable readings. Four Sense Ports — universal inputs for temperature, water-level, leak, and other sensors. Two Drive Ports — switched 12V DC power for small devices, with current monitoring. 0–10V I/O control — send and receive signals to variable-speed pumps, float switches, pushbuttons, and more. Two Command Bus ports — join other HYDROS controllers into one failsafe collective. Controls up to eight HYDROS WiFi devices — manage your full equipment list from the app. Specifications Dimensions (L×W×H): 7.8″ × 3.6″ × 2.5″ Processor: fast dual-core 32-bit — on-device control decisions Health monitoring: internal voltages, currents, CPU status, and temperature Build: splash-proof and dust-resistant industrial enclosure Frequently asked questions What can one Control X4 monitor at once? Temperature, pH, ORP, and water level, among others — thanks to four Sense Ports and two Probe Ports — all without add-on modules. Can the X4 run variable-speed pumps? Yes. Its 0–10V I/O sends and receives signals to variable-speed pumps and other devices. Is the X4 overkill for a small tank? For a basic setup the Control X2 or Control X3 may be plenty. Choose the X4 when you want one controller to do everything on a larger or more advanced system. Pair it with the Control XP8 outlet bar or the Kraken power manager for a complete build — or start with the Control X4 Starter Pack. Shipped fast with expert support. Get your HYDROS gear from real reefers at Marine Concept Supply, with setup help when you need it and local pickup at our Wheeling, IL showroom.
