You can make a burrow out of an "electrical elbow", the 90 degree smooth bends of gray PVC used for electric conduits. Just cut a bit and bury. P. ciliata cannot make a burrow out of aragonite. They do not secrete mucus and have no way of keeping the walls up. So, provide a tube.
Yellow P. ciliata are randomly available online. Just haunt the major sellers and one will turn up "eventually".
The snails and hermits will not be bothered by a P. ciliata. The shrimp and damsels, on the other hand...
Dan
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