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I have had quite a few of these baby clams, and in my experience the little ones do tend to move around a fair bit. This seems to decrease as they get older (anecdotal evidence only). There is probably no simple answer to how to deal with this (or whether you even should do anything), but here's what I do.
The best way I have found so far to keep them more or less stationary is to place them in an empty half shell (clam, oyster, whatever) that is slightly bigger than they are. They almost always will attach themselves firmly to this shell, then you can place them where you want them. Once they are attached in these shells, they seem to stay put fairly well. I don't know why, but it may have to do with the inner curvature of the shell fits their shell quite sugly, maybe they feel secure? Keep in mind though, if they do detach themselves and try to move out of the shell, they are probably telling you they do not share your opinion of a good place. I have had a few larger clams that attached in this way while babies, and that still have the half shell firmly attached, even though they have out grown it. I originally got this suggestion from a guy who keeps the most amazing clam tanks I have ever heard of.
Opinions seem to differ on whether all this moving around is really bad for the clams or not, but I would think that if they are continually attaching and detaching, the energy expended in forming all those byssal threads could probably be better spent elsewhere. Are they attaching temporarily when you place them on the rocks? But if you got 1" growth in 2-3 months, maybe they have no problem with excess energy, that's pretty amazing.
Also, I feed my baby clams using the method described at clamsdirect.com: I place them in a small container every couple of days to give them DTs direct without putting it in the tank. I have never noticed any signs of stress from this (completely re-extend the mantle within minutes if not seconds, no gaping, etc), but your mileage on this may vary.
Hope this helps.
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