What type of crab is this?

[rattslik]

This crabs has been in my tank for months and he hasn't been a issue. But today I did a water change because I got more live rock and I thought I would get him out and I identify it. I also found this little crab while looking around my tank but he is so small that it would be hard to identify.

 

[OrionN]

I cannot ID the species of these crabs, but these crabs do not belong in a reef tank. Need to get them out. Look at the claws, if they are pointy and sharp, these are predators and need to be remove. Herbivores crabs have the tip of the claws that are spoon shape.

 

[vetteguy53081]

Its a Xanthid crab and one you do not want in tank. It will eat anything and everything and grow quickly. A jar slanted with a piece of shrimp makes great trap. I see you have it out already. There is a specific tank I recommend for them below

 

[malacoda]

If you don't have space for a jar, a large shot glass will also work.