Depends entirely on what type of mantis shrimp you are looking to keep. I kept a Wennarae (sp?) in a 5 gallon tank for many years, but they don't get larger than 2" or so.
Others get substantially larger, and will need a larger tank with strong walls!
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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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