Just found 2 crabs in my tank

[Kgrizzle]

Lol I guess I shouldn't worry if they fight eh not like they cost anything but still wouldn't mind trying to keep them... Oddly enough they survived a 20 min car ride with out water

[Nano]

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

[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.

[paddyob]

Originally Posted by Kgrizzle

Lol I guess I shouldn't worry if they fight eh not like they cost anything but still wouldn't mind trying to keep them... Oddly enough they survived a 20 min car ride with out water

Bad idea all around. Most hitch hiker crabs are predators. Unless you can 100% ident them... Flush them or feed a hungry trigger.

Lots survives on live rock. Live rock is shipped internationally wet but not in water.... Imagine the weight of 1000 lbs of rock IN water.

20 minute car ride is nothing.

Good luck.