Hi BettaFish.com I am a 1 week old aquarist who just got his first tank setup, a 3 gallon tetra half moon with a filter for my Betta fish, but I want to get him a heater. This was the one I wanted (below) but the lady at the store wouldn't sell it to me saying it will melt my plastic tank. Any...

well, I waited 2 weeks for this 50 watt ViaAqua heater to arrive and I read the manual. Everything sounds fine until it says it requires a GFCI outlet only.. I think this outlet keeps it from overheating? It's an adjustable heater, so if I kept it at betta temp, how can it overheat? My previous...