Worm or alien poop or?

Anthrilliel

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Very new to marine tanks. I just got a couple snails and i saw that alien green thing on it. Is it poop or a worm? Do I need to do anything? It is not moving.
20201114_160124.jpg
 
That's a snail (the red "rock") ;)
And it look snail (the green one), can be chaeto macro algae, but if it's moving on the snail shell it's a slug (don't remember the name of it).
But again w/o another photo from different angle can't confirm 100% (can be slug/nudi, can be chaetomorpha algae )
 

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