What are these things circled?

[Tartufo]

These popped up in the last few days.

Red: I am most interested in as this seems to be growing from a marine cultured rock
Blue: I am concerned that these are "pest" snails, or snails in general.

 

[Crabs McJones]

Spiroribid worms
harmless filter feeders

 

[Gumbies R Us]

Nothing to worry about with the worms circled in blue, those are common filter feeders that appear as your tank matures