Coral hitchhiker Identification

[W0terMoist]

Bought a new frag today and after it got settled in I noticed some hitchhikers. Circled in red is a feather duster but what I have circled in yellow has the appearance of tiny mushrooms almost. I am not certain if they are mushrooms or some other creature that has the appearance of a mushroom. Their fanned portion looks to be solid but I am not sure. And circled in pink, is a tiny snail shell. I don't know if I should remove or not incase it is not reef safe.

 

[blaxsun]

Snail shell should be easy to remove. I can't really tell what it is that's circled in yellow.

 

[ying yang]

In pink could it be a little colinista snail ?
In yellow looks like some kind of polyp like clove polypsaybe but unsure tbh

 

[ScubaFish802]

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