stray voltage help needed

[jfl14609]

Was feeding the fish tonight and got a little zap. I unplugged everything and have been checking vac with my multimeter. For some reason everything I plug in somehow puts voltage into the tank is this normal just at small amount my heater is doing about 9 vac alone and my powerhead is about 3. I did catch my seio and took it out around 38. for a ground I am using a wire wrapped around a screw driver to get my meter readings my house is really old so I don’t trust the grounds in the outlets. Any help would be greatly appreciated
Thanks
Jeff

 

[rsw686]

Yep thats from induced voltage and the tank having a different ground potential. What you should do is measure the current flow from your tank one device at a time to the ground. That will give you an idea of the device thats leaking.