Induced voltage is the most common type of voltage that flags when hobbyists test their aquariums, its often noticed by hobbyists putting their hands in the water then touching a metal object such as a metal stand or a light chassis/mount wires that have a route to earth. This allows the small induced voltage to discharge to earth straight away and they feel a small zap, at this point they feel that they have been electrocuted by faulty equipment but this isn't the case.

 

 

To prevent induced currents or static charges a titanium ground probe or even a Titanium Schego heater, as the titanium jackets of these heaters are grounded through the plug providing a rather nice earth probe as well as a heater, can be used. This will allow any induced voltage to automatically go to ground and not build up in the tank. If there is a real voltage leak caused by the insulation break down of an electrical item the ground probe will generally cause a modern circit breaker to trip due to the short to ground being detected.