Ok I was at bigalsonline shopping for a new aquarium and some stuff to go with it. I was at accessories and saw 2 ground probes. I clicked on one and it said some stuff about stray voltage. I googles it and now I understand what stray voltage is. But is it only in saltwater or is it also in freshwater? Do I need a ground probe? They're worth it if it could help keep my fish healthier. I'm using a 1 time coupon code so I want to buy everything in need in 1 order. So it's better for me to buy it now then wait until I need it? So the question is do I need it? I plan to buy a 12 gallon eclipse with a 50 watt marineland stealth pro heater and 3 albino Cory catfish and my already owned female betta if that matters.