Never depend on suction cups. Never. Eventually, they will let you down.
Assume that your heater thermostats will eventually fail. Limit your risk by using 2 or more (undersized) heaters. It is extremely unlikely that they will all fail at the same time and failure in one won't be enough to kill your tank.
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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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