if you can get your hands on a voltmeter you can check the fixture for current, i would also imagine it would work for the water as well.
Hope that helps.
someone might want to chime in on this, but if there is electrical current in the water the voltmeter should pick it up
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65 gallon saltwater tank, 60lbs live sand, 85lbs live rock, 2 ocellaris clowns, spotted goby, Flame hawkfish, scopas tang, numerous corals 
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