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Reef Breeders EXO ATO
The Reef Breeders Exo-ATO (External ATO) is one of the first ATO systems to contain all electronics outside of your aquarium. The controller and sensor mount to the outside of the glass, and a small magnetic ring is inserted at your desired water level. That leaves only a 1/2? thick x 1? diameter ring inside your sump, so it will fit easily in clear acrylic or glass sumps!