a hitchhiker i'v never seen before

i just fed my fish some frozen brine, and out popped some thing that looked at first like a scooter blenny. it was almost the exact same colors. the head looked like a hermit crabs head with the beety eyes on the antennaes. the body was mabey 1 1/4'' long almost like a fat worm. and the tail looked like a lobster or crayfish, kinda fanned out. you are all gonna hate me because i couldnt get my camera to work, and my cell camera wont email. but if anyone has seen something like this, i'd really like to know what it is.

ok, the tail looks the same as pictured, but not at all those colors. more of a brown and white striped. the body wasnt big segmented scales like pictured. it was more smooth like a worm but fatter like a catterpiller. and i didnt notice the mantis like folded claw leg things in front part of body. and eyes were sticking out more.