Crab and 2 snails ID

[Antaguana]

Can anyone ID this crab, it was a hitchhiker who came in on the rock of a favia from the LFS.
This is in Australia (which should hopefully narrow it down a bit)
It is quite small, 15-20mm (1/2-3/4 inch) from back to tip of claw ~5mm (1/4 inch) across the body

I have taken it off the Favia and put it in QT. I am looking for an ID and / or opinions about putting it in the DT with coral, fish hermits etc

This was on the rock too. Based on the stick I am pretty sure this is a Stomatella Snail, would appreciate confirmation before I put it in the DT.
Has a hard shell about 1/2 the size of the foot. and is about 15-20mm long (1/2-3/4 inch)

This one is only about 3mm (1/8 inch) The Red Sea logo is so the camera had something to focus on. ID? Friend or Foe?
It is a very small snail with mottled spiral shell (looks a lot like an Australian sweet lupin seed)

 

[kjkszpj9]

1st pic is a squat lobster and 2nd 3rd pics are both stomatella snails but 2nd ones a dead one but i assume you only show the shell.

 

[Antaguana]

1st pic is a squat lobster and 2nd 3rd pics are both stomatella snails but 2nd ones a dead one but i assume you only show the shell.

Thanks.

Looking at some other photos of squat lobsters I agree they look a lot like this. Knowing the name makes it so much easier to find comparison photos.

Both the snails are alive. They are climbing up the sides of the QT tank and sitting at the waterline. Pic 3 is very small and was retracted into the shell as it didn't like me taking it out of the water and putting it on paper to get a decent photo.