Cannot get an AC reading, either the meter can't go low enough or it ain't there.First suspect : pumps and power heads, second: fluorescent lights.
Check your AC voltage, it's possibly much higher...
OK, I have done it and I get a lower reading - 50 mVYou can't really just test like that, as its measuring the potential differance between the 2 probes in the water only, Try do a test by placing 1 probe in the water and the other on somehing that is earthed, perhaps the aluminium cover of a lighting hood (If you know its earthed)..... then you will start getting some true results....
BUT BE CAREFULL
OK, I have done it and I get a lower reading - 50 mV
I only picked up there was a voltage because of a wound on my hand. I cannot feel it on my other hand.That shouldn't be problem, in other words, if you are standing on the floor bare foot with a hand in the tank, a voltage of 50mv would pass through your body if you were made out of a conductor like copper, but you not, so only a fraction of the 50mv will pass through you. you should be safe.
Totally agree, earthing tank is not a good idea.IIRC titanium bicycle spokes can also work well as a tank earther. But rather find the source of the leakage and stop it, a big (electrical) current in the tank can cause problems in fish, especially tangs (lateral line erosion)
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