Seems like everything eats poor hermit crabs even hermits crabs themselves just because they want that ones shell even tho there are 30 more just like it laying 2 inches away thank you for the reply and mantis shrimp can be a great addition with everyone seeing it being like what is that just about everything we keep can and will become preditory if its hungry enoff hope you have good luck with the little guy also based on the pic hard to see I think its a Chiragra Mantis which only get 4 inches or so I had one a long long time ago basher came in on live rock and it never ever hurt anything except hermits and a small snail every now and again they are not powerfully enoff to break glass or think snail shells like turbo and it ate frozen my sis brine and I hand feed it krill start with tweezers untill it gets used to taking food from you as I got poped one time left a pretty good blood blister