If the crab is in the eye of the chalice I would try a coral dip, it might drive the crab out. I have a chalice that was receading and had white lines forming on it, I dipped it in CoralRX and it recovered and started growing again, I feed my chalices meaty foods twice a week @ an hour after lights out.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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