I don't think the Matrix is the problem here. I use two canisters of it in my AC110's and I had no problems. I think replacing your media completely is a problem. Make sure you rinse this stuff out well before use.
it was expensive at 83 cents a gallon but cheaper than restocking the tank. the water is drinkable but I do not trust it lately with all of the rain that we have had here. the source is a reservoir lake about 20 miles of where I live and I just went on a hunch that the treatment for the runoff might be doing it.
as for the electrical system, its all dry and there are no shorts as far as i know.
I used stresscoat as a water conditioner, I also have nutrafin water conditioner on standby. I am not touching the ph anymore.
as far as the earth leakage goes, im googling it and im still a bit puzzled. everything is hooked up to power strips with circuit breakers and all together the tank setup draws only 253 watts.