Just found 2 crabs in my tank

[Aquattro]

Originally Posted by nanomano

if they turn out to be "not reef safe" (what crab is right) I would throw them in the sump then they can keep live rock clean

Unless I have a crab living in a coral and doing damage, I almost never remove them. Unless they're big, or you have really small fish, they're all mostly fine. My rule is unless they do something bad, they get to stay.

[Nano]

lol good rule, my emerald crab is going to be getting banished to the sump once I upgrade my tank, he likes to taste my Zoanthids.

[Nano]

shrimp will work for sure. I put shrimp in a net and left it for 20 minutes and pulled out a 3 inch bristle worm!! I put him back but its was neat

[naesco]

Originally Posted by Aquattro

Unless I have a crab living in a coral and doing damage, I almost never remove them. Unless they're big, or you have really small fish, they're all mostly fine. My rule is unless they do something bad, they get to stay.

I have been reefing for for 20 years and have never seen a crab attack a coral or fish.
They might I guess if you do not feed them. Drop a pellet in their direction from time to time.

I agree they are completely fine in your tank.