two crabs,a barnacle and something weird

need help in identifying these things...also would like to know if they are beneficial or detrimental to my reef aquarium....

1. Weird crab



2) could only get a pic of the crabs pincer but he is large, red and hairy



3. Think this is a barnacle but i could be wrong



4. I think this is some sort of anemone as i see almost a little colony there moving i the water. it is the brown thing to the right of the large hole. I also think the white thing between the zoas is an anemone

much thanks to anyone who tries to help me.

 

Can't possitively id crabs from those pics, but from the claws can def say that they are bad and you want to get rid of them.

 

ouch how can you tell from the claws that they are bad?

 

cant identify what your 4 pic is, but i can tell you that there is aiptasia in that pic to the right of the brown thing, untop of the zoas

 

Some say that if the claws are jagged/sharp that they are not reef safe and that if they are "rounded" that they are safe.

 

yup i got rid of the aiptasia right after i took the pic with joe's juice.

If you look closely on the 4th pic you will see a conical shell, this would be cool except it moves