same thing happened to me--only it was broken by a clarkie I had put in the sump. It blew all the gfi's but I was able to reset and then I saw the arching.
I got rid of all glass heaters in my tanks--I use the teflon cased ones now.
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"evrr bean to sea Billy--evrr smelled a fish?" "Aye capn..experience is the best teacher"
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