Hey guys so I've had my 20g long for about 7 months now and I'm looking into getting a auto top off system. As of now I've been doing water changes every week and topping off manually about every 2 days. Everything seems to be going well but I really want to keep salinity stable. Only reason I've been hesitant to get one is because I'm scared it might malfunction and ruin my tank. If anyone has any recommendations on RELIABLE ato's for smaller tanks please let me know.