So there are like 200 sand dollars out on the beach still alive. Think I can bring for home for my tank? Also there are the little thing that dig under the sand. " they are in a shell; it's kill s of hard to explain them"
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If the things in the sand looked like this:
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they are sand crabs.
And I agree....leave it at the beach.
No thats not it, it looks like a clam but not. I'm home now an still id like to know the name of those animals. So if you step where the tide comes up and dig you will see hundreds of them. They are all color white with either purple,yellow.
when I was a kid and always went to st Pete beach id dig my hand into the sand and see a ton of them at the surface then quickly burrowed as deep as they could and it used to tickle my palm! 

