The animals in the Valenciennea genus are all burrowers. I think the hermit crab-moving behaviour was simply part of this, as they regularly move largeish pieces of the substrate around. My V. puellaris has attempted to use snails and crabs to shore up her burrow and puts them back into place if she catches them as they wander away. I don't feel that this is likely to grow into a significant concern, nor do I think it is likely to cause a great deal of harm to the affected invertebrate, as they tend to weasel into odd locations on their own without any participation by the goby. Here's a good article on these fish: http://www.reefkeeping.com/issues/2003-09/hcs3/
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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