There are crabs that can do harm to acros and there are others that are benificial. The bad one will eat polyps off from the acro. The good ones live off from the slime from the acro and can help keep it free from acro pests.
From what I understand Acro crabs have symbiotic relationship with the coral. They receive protection and provide house keeping services. This of course is very simplistic description so hopefully someone with more knowledge can provide something more substantial.
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