CoralVue HYDROS X3 Pro PackThe Ultimate Aquarium Monitoring and Control System The HYDROS Control X3 Pro Pack includes two Control devices, the Control XP8 and Control X3. Combine these Controls to create a secure and impressive set up for both saltwater and freshwater aquariums. Connect up to two sensors such as temperature sensors, water level sensors, and leak detectors to the Control X3 and monitor pH or ORP through the available Probe Port. Connect up to eight pieces of