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Hi,
Just because you saw that crab ONCE doesn't mean it hasn't made a regular habit of traipsing all over your polyp bed, especially when you're not around.
The same logic applies to any assumption that the crab ISN'T chowing on polyps. You might simply have missed catching the crab in the act. You can maybe check very, very, very closely for signs of injury: missing polyps and so on.
For so long as there is a source of irritation around, polyps will likely be shy. Everything from an abrupt shift in water chemistry (from an aggressive water change or even contamination), a shift in temp, some physical irritation or predation --you will have to verify just what it is.
Good luck,
horge
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