Time for a long overdue overview of how I set up my Auto Water Change (AWC) and Auto Top-Off (ATO) systems! First, let’s start off with the major components. The most important component of my Auto Water Change system is the GHL Profilux Controller, seen here. In the case of the AWC (Auto Water Change), I created a Timer. 8x per day, the Profilux turns on the AWC pump for a specified amount of time.The Profilux also controls the ATO (Auto Top-Off). The water level in the tank needs to be monitored, so I installed an optical level sensor.The level sensor is seen here on the right. It’s held in…