Gfci
Mixing electricity and water is NOT a good idea. Especially saltwater, it is a WONDERFUL conductor of electricity. If you are going to have a SW tank you NEED Ground Fault Circuit Interrupt technology on ALL plugs that go anywhere near your tank. Why Because if you don't, it could KILL you. Or at least shock you very badly. Make sure stuff above your aquarium, such as lights, are also on GFCI protected plugs, you will eventually knock something electrical into the tank if you stay in the hobby...