Product Overview

The Neptunian Smart Water Top Off is an automatic aquarium water top-off (ATO) system designed to maintain stable water levels by automatically adding water to replace evaporation. As water evaporates from your reef, marine, or freshwater tank, this smart system detects the change and refills the aquarium or sump accordingly, helping to keep salinity and water conditions consistent — which is essential for the health of corals, fish, and invertebrates. ATO systems reduce daily maintenance and provide peace of mind when you’re away from home.