What is it

[IMPERATORFAN]

I posted this in reef discussion and someone said this forum could possibly help. Any thoughts?

Anyone know what this is? I tried to grab it with pinchers and it rolled up into the shape of a stretched out acorn.

 

[capncapo]

A clear, close-up photo would help considerably but I'll say it's a chiton.

 

[charlesr1958]

I'm thinking some type of Isopod