can anyone help me clear up this mystery? how can i make sure nothing in my tank gets electrocuted (including my arm)? my outlets are not grounded in my home, so traditional ground probes will not do anything...i have read about plug-in residual circuit breakers (rcb), but cannot find one anywhere i search, only the kind that install into the breaker box...do i need to install these? where can i find the plug-in variety? how important is this? any other solutions? any help on this matter will be much appreciated....thanks in advance from a neophyte reefkeeper