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http://www.seascapestudio.net/reference/invertebrate.php?id=100 Here is a link i found of the same thing. Once again, THANKS

I have been doing a lot of searching and "sea squirt" is where i have been seeing a lot of these. Thanks.

WE THOUGHT IT WAS A ROCK. PLACED IN BAG.(WITH OTHER ROCK) BROUGHT HOME. PUT IN TANK. SUPRIZE

See The hole on the far right of it? (looks like a square) If u get close to it, it will close (The whole thing will shrink) It weighs almost nothing and is about 4-5 inches long. I got this at my pet store today with some live rock but they didn't say anything about what it is.