One of my crabs has barnacles!

barnicles are filter feeders that are hard to care for. they will probably die, but even if they spread, i wouldnt be concerned.
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Those actually look like limpets. I've got a turbo snail with a limpet on his shell. Really cool to see them both feeding on algae on the front panel.
 
The pic yesterday looked like barnacles to me, judging by the ones I've had in the past.

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Yes, those look like barnacles in the latest images.
 
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