ID small crab and snail

Sarah007

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bought a new 11 pound Fiji rock a couple days ago and am seeing a small snail and crab, probably more critters yet to be discovered. The snail is probably 1/16 of an inch across and the crab is about 1/8 of an inch across (very rough estimates). Please let me know if either of the guys are known pests. Thanks much!
close up of crab
IMG_0368 2.JPG


pretty hard to see the snail, but it is in the middle of this shot. It has a creme colored shell, pointed, with black dots. Also some sorts of flora/fauna growing on the shell.
IMG_0375.JPG
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

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