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I would imagine it depends on how clean the glass is, and how heavy the conch. :-)
Since mine are small, and the glass is rather dirty :-( they can climb pretty much at will. I've even seen them climb into the path of a powerhead and then they look like the shell is going to be blown off any moment... So I sometimes feel bad and knock them off at that point, fearing they'll just hold on until it kills them...
Brad
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"It is hard to save a nation in which a jar of pickles sells for more than an ox."
M. Porcius Cato, Rome, 2nd Century BCE
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