Just so you guys know. A ground probe is not good if you don't have a gfci. A ground probe essentially will just complete a circuit on a regular cicuit breaker and it won't trip until the current is exceeded. 30amps through your tank??? That sounds scary. As randy said though. A ground probe is a GREAT addition if you have a GFCI so it can detect a much smaller leakage. Cheers
Sean
Sean