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FWIW, those probes and the monitor itself can be very sensitive to any electrical interference at the outlet or in the water. They even react when the cord is in close proximity to other wires particularly ballst and wave makers.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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