My FW holding tank is nearly 100 gallons, and it is 3 feet off the ground. Since the water line is JG tubing (really small), the Kent float valve easily holds the pressure.
Nevertheless, I do have a float switch solenoid that will close the line in the event of unusually high water level in the sump.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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