If you can.. or cover them with epoxy, although I've heard they can just work their way around that. They can spread and they burrow deep into your rock so getting rid of them is not as easy as you'd think. They seem harmless but .. yeah, as you've noticed, they're not completely benign either.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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