Shrimp or what, good or bad

[Finnjävel]

Size is something 12 millimeters. It came with corals and two bristles. RIP bristles but who is this guy?

 

[Dolphins18]

Mantis shrimp. Dangerous little guys, will usually kill most snails/crabs/shrimp/clams/some fish.
Incredible animals, but the tank has to built around them.

 

[reverse]

Amphipod.

 

[Dolphins18]

Actually it may be an amphipod, see if it has eyes, google picture of mantis shrimp and if it has those eyes its mantis, if not likely a large amphipod.

 

[Sharkbait19]

Video won’t play for me, do you have pics?
I’m thinking it’s an amphipod anyway. Mantises are rare hitchhikers.

 

[Finnjävel]

Ok. Thanks for answers. So nothing special...