One thing you could do is take a voltage meter and put one end on the grounding probe and one in the aquarium. Then unplug things one at a time to see what is causing the stray voltage. This technique is very similar to just unplugging things one by one and getting a shock.
Try those two but let your tank build up a voltage between checks(unplug everything get a shock then plug the first thing in wait 5 min if no shock unplug it and plug the next device in).
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