If you look they are also common in NC but they like to hide under or in stuff.
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Where did you get this reference material. If it's available for sale I would like to get.
The reef identification books by Paul Humann and Ned Deloach are a wonderful resource and will help you learn to recognize and identify many reef creatures, see the link below; you may also be able to find them used on ebay.
The 3 main books for the Caribbean are: Reef Fish, Reef Creatures, and Reef Coral.
https://www.amazon.com/Paul-Humann/e/B000APY7AO
Where did you get this reference material. If it's available for sale I would like to get.
I think it is some sort of coral/sponge. Could be wrong.What is the dark-grey brown thing behind the arrow crab?
it's coral.What is the dark-grey brown thing behind the arrow crab?