Wow biker, this makes my head hurt! Question, when you were switching the the plugs on the right unit back on, did you do so one by one? That way, you should at least be able to identify the major culprit. Some of the varying voltages are confusing to say the least (including the increase you are seeing when you switch off the korallia) but it sounds like at least one device is leaking current into the tank and there may be something funky going on with one of the power strips as well. Unfortunately, it's been way too long since my physics classes to come up with a reasonable explanation for you. Any electricians out there???