Quote:
Originally Posted by Reef Pilot
Leak detection systems are normally outside your tanks, on the floor... 
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Yes, thanks, I get that. I have a small battery operated one in the basement next to my RO system waste water collection container. Even that appears to have stainless steel probes. Reading the opening post led me to believe the individual has these probes in the reef system since he's using them with his Apex to control pumps, not simply sound an alarm. Even mentions he has one on the top of his tank. Some systems use float switches for that, so I reckon that's where my train of thought was. Either way, never a bad idea to be cautious with the use of copper around a reef tank.