I've had to remove a GBTA from a rock once that never did let go. I tried hanging it upside down, massaging the base, pointing a powerhead at it, prying at the base with a credit card, leaving it un-submerged and even rubbing it with ice cubes. In the end I had to smash the rock and remove it with the fragments still attached to its foot. Anyone keeping anemones in a tank for sale should know to only have small rock rubble with them or should be prepared to grab a hammer and a chisel.
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