Urchin ID

ThunderGoose

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My live rock (TB Saltwater) came in with several urchins. This one has doubled in size since I first noticed her (2 weeks, maybe) - she carried shells around and has pale spines. Any ideas?

2017 July 22 w urchin belly.jpg
2017 July 22 w urchin side.jpg


And is this one a black longspine? She doesn't carry things around and she's growing very fast, too.

2017 July 20 urchin and friends.jpg


She used to fit in a crevice in that rock behind her. She arrived either June 12 or 21 (on live rock).
 

Gexx

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First one looks like a shortspine urchin or a type of pincushion. The second is a Diadema urchin i believe
 

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