What Are Those Shrimps In My Tank?

[tanyauk]

hi! I have few shrimps in my tank who came with live rock, they are getting bigger. there were about 6 of them, but now I have 2 left the biggest ones (they probaly killed the rest). They are about 1cm long, brownish back, used to be transparent. They hide in the rock I can't take the picture. Do you know if they are harmless? Mantis?

 

[-Nemo-]

Nothing immediately pops into my head.
A picture would help greatly.

 

[N1z]

Do they have 2 big eyes the move loads? Quite long bodies aswell?

 

[tanyauk]

I don't think their eyes are big, they move a lot, but always hide, bodies are long, curled tail, brown back, ...@) and small...so far..

 

[N1z]

Hmm sounds like a mantis really try and get some pics if u can.

 

[SkiFletch]

Are their main claws equally sized, or do they have one on the left bigger than the right or vice versa