Are these reef safe crabs?

[BrettDS]

I found these crabs as I was upgrading my tank and I pulled them out for now. Are they safe to put back into the tank?

http://uploads.tapatalk-cdn.com/20160312/fc071b69b0a269e0007f0e38237fde0d.jpghttp://uploads.tapatalk-cdn.com/20160312/e6e0b2946eca7dcc4917b0892f0c4743.jpg

[Bent]

Nope. Hairy, black claws. Those are a couple of murderous, meat eating, malevolent, monstrosities.

Sump em.

[jbvdhp]

Butter n garlic.

[DLreef]

Neat little critter for a pico tank or sump though :)

[Fiver]

Had those as hitchhikers. They cut off my serpent Stars' arms, cut coral polyps and tried to cut off my anemone's tentacles.

[scottsdale454ss]

pretty sure mine attacked and ultimately killed my brittle star. also some snails. But he's fun to look for and watch so he's still in the tank. Ive had him for at least 5 years.