I would think it would take more than 1.2 VAC for you to feel the voltage. I have more than that and feel nothing. I have read that aquariums have some measurable leaking current even if the equipment is in good shape due to induction from anything that has a motor, ie pumps. It you want to remove all current from the water you could install a grounding probe, but there are pros and cons to that. My ato from autotopoff.com is putting a slight current into the water probably from a defective float valve that should be replaced.