You can buy a "GFI" (or GFCI) extention cord at any hardware store. GFI stands for Ground Fault Interupter. It should be used anywhere there is water present and electrical connections. If there is a short circuit or any funny business at all (faulty equipement, something gets wet, etc.) it will trip the breaker and shut everything off in a nanosecond until it is reset. You can buy GFI outlets and wire them in as you would any other outlet, or you can buy "plug-in" GFI outlets that come in many configurations - extention cords, multiple outlets, strip type, etc. I have the plug-in extension cord type on my aquarium outlet. It's about 1 foot long and has a breaker at the plug end and a 3 outlet strip on the other - into this end, I plug in my power strip with all my connections (filter, heaters, p/hs, air pump, whatever). Anyone who reads this and does not have one should go out right now and get one. They cost around $20.00, install in less than 1 minute, and will save your life.