I find the angle of the rock under the byssal gland make a difference as does its texture. Too bumpy no good, wrong angle no good (and it seems to differ from clam to clam), etc.
FWIW I have mine in about 50x turnover. Some seem to do OK with glued-in rubble forming a 1" lip around them and others I've had to have the "wall" as high as 3/4 of the clam on some edges (not the whole way around though).
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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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