I.D Please

[MarineDan]

Hi,

I was watching my tank this morning before I left for work and the lights were off as not due to come on yet and I noticed a small like crab walking around on my live rock. I looked to be like a grey colour almost see through? I didn't buy it but added live rock the otherday so wondering if it came from that?

 

[Pruett-nc]

It probably was hiding in a hole like it is now when you picked the rock up .