Possible pest copepod?

[Xxflounderxx]

So I lost a few corals lately trying to figure out is this is a pest they are the white ones next to my copepods about 4 times the size any help is greatly appreciated

 

[WheatToast]

Collonista snail. These beneficial hitchhikers stay small and graze on algae.

 

[Xxflounderxx]

Collonista snail. These beneficial hitchhikers stay small and graze on algae.

I was sweating it thank you!