Clam perches require a bit of an art. Usually clams attach to a rock and then they hold fast but eventually usually they let go and then are sort of loose. If it's possible to get knocked over easily then they'll probably get knocked over sooner or later.
Except for the sand dwelling clams (squamosa, derasa, hippopus - usually the ones with a small byssal opening) I try to keep my clams on rocks. But I try to keep them in a more of an opening in the rock where the rock covers at least 25%-30% of the shell height so that to get knocked over they have to be literally lifted out first. Usually then they stay put. I usually just take some rubble and epoxy and build up the area around the clam - rather than just finding the "perfect" spot, since usually a "perfect" spot needs to change once in a while after they grow bigger and so on.
Hope this makes sense..
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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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