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After my submersible heater came apart and electocuted the whole tank, killed all corals, inverts, and fish, contaminated the LR, LS, plumbing, and silicone with copper, I consider a ground probe and GFCI a must.
It was without a doubt the most complete destruction that I've ever seen of a reef tank, short of a tank coming apart and flooding the house.
A ground probe was the first thing I bought when I started over.... I won't make that mistake again!
Chuck
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