snails are good they help clean the glass, sandbeds and rocks depending on what type you add.
fish are for looks.
btw if you don't have a copy i recommend you grab the "Conscientious Marine Aquarist " it's a great book that you should probably have for reference.
http://www.jlaquatics.com/phpstore/s...uct_ID=lit-cma
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Given sufficient thrust pigs will fly just fine.
90 Gallon LPS tank - Challice, Acans, Favia, Diplo and Zoos
125 Gallon SPS Coming Soon!
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