manthis shrimp...for sure. rule of thum (for me at least), is to kill/toss any crabs or snails. the worms are gross, but beneficial. but, you really can't tell what you're gonna end up with until you put it in your tank and see what's crawling around or growing on the rock. I put a new coral in mine the other day, and this morning i saw a little snail on my back glass, under the rocks. just waiting for him to come out so i can smash him. however, if you do see something obvious on there, throw it off before putting it in your tank.
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