What Are These Things!

Today I was staring at my tank and noticed all these different creatures that I could roughly guess but not really give a secure identification. Are they reef safe and can I keep them or will I have to get rid of them.
Pic 1: Maybe a mushroom coral?
Pic 2: A coral of some sort but with tentacles.
Pic 3: A type of anemone?
Pic 4: Again, an anemone?
Really like to find out what they are, hope someone can help.
Also sorry for the bad quality of the pics, it's always hard taking pictures of tiny things from the outside of the tank.

 

#1 I agree
#2 is a coral but the name escapes me for now.
#3 might be, need to know more about the way the coral is anchored.
#4 is a chiton if I am seeing it right. It is kind of like a snail and a good member of your clean up crew.

Try to shoot square on to the glass when taking pictures whenever possible.

 

Here's another shot of picture 3, what i think is maybe an anemone.... this one is really really bad but you can just make out the fairly long creamy stalk that it is anchored by.