Ya I dont know if I need the netmodule but its cool that its an option. As far as siphon goes, I was gonna have the reserve in the stand below the tank, so I wonder if that would siphon. I guess the ato out line could be above water level so that it couldnt. Any good links on ato's? Also orp or salintiy more important to monitor? Honestly I dont understand orp yet( im still reading up on it)