Foraminifera perhaps?

Found some interesting critters in some sand from Frank's Tanks.

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I believe, based on comparing image searches, that it's a foraminifera..

e.g. - http://ocean.si.edu/sites/default/files/styles/colorbox_full/public/photos/Amphistegina-Hallock_92_1-full_1.jpg?itok=u2MkNE9g
 
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