| i wont dispute the placemnt issue, i haev seen peopel successful placing them on teh sand and on the rock. the only issue i will mention is that if it is in the sand bed, make sure there is nothing munching on it. i have heard of this happening a few times. not that this wont happen on a rock, but its seems more liekly in the sand bed...
ok that aside, i too have a crocea that moved its self... i have on that sat where i put it, and over the last year, has literally bored itself about 1/2 inch into the rock its on.
the only that moved insisted on laying on its side. i would fix it and the next day it was on its side, after a few weeks of trying to correct it i figured.. hey, if thats what you want, fine. it attached to the rock behind it and stayed there all happy for many months until i did some rearranging...
moral of the story, is to let it move how it wants to, just monitor its overall health
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