H. aurora would also be my first guess, though a rock flower anemone would also be possible. A clearer picture of the mouth disc would be required to see if the long tentacles are limited to the outer rim (Phymanthus crucifer) or if it also has tentacles near the mouth (Heteractis aurora).
The easiest way to eliminate one or the other would be if you knew whether it came with a shipment from the Caribbean or the Indo-Pacific.
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