Why can't you grab them bare handed, just wondering, I think I have one in my tank to, the other night I bought a piece of rock to add to the top of my rock to fill in a hole and I think I can hear it tick but only sometimes, the other day I lifted the rock up and on the bottom looked like a something with alot of legs but crawled right back where it came from, Going to try to catch soon, pretty sure it is a mantis shirmp but we'll find out soon, will be sure to post some pictures when I can