Reef Breeders Exo-ATO

Reef Breeders Exo-ATOThe 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! Fully Self Contained. The Reef Breeders Exo ATO is fully self contained,