You know, I picked up a shell from a dead clam that was on the beach among mountains of coral skeletons that was the perfect size for my wandering clam. It nestled right in there. Then after a day violently launched itself out. Those clam holders are just the same idea -- very cool.
As for Albano: look, I'm sure there's someone somewhere who successfully doses bleach into his or her reef. Is it a good idea or one to recommend? Definitely not.
If a clam wants to move it has a good reason for wanting to do so. Taking action that would prevent that movement will stress the clam and endanger it. I can't see any benefit to gluing a clam to a frag disc or to rubble rock.
Whatever the approach is, you want the clam to have the opportunity to let you know it doesn't like where it is, by enabling it to move if it wants to.
