If it starts to hinder the shell movement, it might be a problem. Otherwise though it really is kind of something that happens. If you see these clams in the wild, usually all you see is the mantle coming out of a hole in a rock and they almost look like seaslugs or nudibranchs. They are accustomed to stuff growing around them.
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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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