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					Originally Posted by  MoreDakka
					 
				 
				 Going to have a water sensor as well to kill the power once as a last resort.  That's more of a project that I will need to figure out. 
			
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 http://www.canreef.com/vbulletin/sho...272#post793272
I made this DIY water sensor with just a couple nails, solder, and some wire. Works great, even with fresh water. It acts as a switch, open when dry, and closed when wet. Then you need a device, like a controller (I use my Apex), that will turn a pump switch off, when this is on. Or you could build a relay that trips a switch on and off. Lots of ways to do it...