Make it unhappy in the spot that it has attached to and they will often let go. I'm trying to get a crocea off of a rock that I want to remove so I've shifted the rock so that the clam is hanging over the edge (short drop). I dont expect it to take longer than a day or two for the clam to get tired of fighting gravity and let go. When it does I'll be there to turn it upright again (unemployed with nothing better to do).
I'm not really recommending this I'm just saying it tends to work. The best thing to do is have them attach to a small piece of rock or shell so that you can move the pair anywhere you want.
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