I have seen what I think is a baby mantis shrimp in my tank that hitchhiked in on some live rock. It's not very big, 1/2 an inch probably and is plain brown. I thought it might be a pistal shrimp but it has white eyes that are like little slits detached on the top of it's head that are able to move separately (in different directions). It's very strange. I did try to trap it once with the inverted water bottle but eventually gave up. So far it hasn't done any damage (that I know of) but it is something I will probably have to deal with later. I do have 2 cleaner shrimp and though there are lots of snail shells around, none have holes in them or anything like that. My tank is FOWLR with a hitchhiker BTA.
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