If there is one automated accessory we suggest, it is an Auto Top Off (ATO) System. When a Freshwater & Saltwater Aquarium evaporates water, the salt & minerals are left behind increasing the salinity and TDS. Maintaining a constant water level in your aquarium or sump can lead to much healthier livestock, coral, plants and even better performance for your protein skimmers and other equipment. Auto Top Off Systems will normally include a controller that connects a sensor & the pump to transfer the water from a reservoir to your aquarium. The sensor in your aquarium will be able to sense the water level and when it drops low enough, the pump will turn on, pumping fresh water into your aquarium until the desired water level is reached.