Hi my Rene smart heater fell down few days back dunno how long it was down for . My big female ray as now a burn mark under her disc so looks like she sat on it. So all Iam saying is even smart heaters are not ray safe if it falls of tank side .
i prefer to have them in sump and tank incase your return pump fails and the tank go's cold. Same with filteration best have an external filter as well as a sumpjeffers;4579262; said:thats a good idea i have 2 of them in my sump. one can handle it if its on 24/7 but that will wear them out fast and you wont know you have a broken heater till its too late.