Tiny antennae poking out of sand?

[Kaisentlaia]

I just noticed a new critter and some googling didn't help me identify it. It probably came with the new corals I got lately (looks like dipping didn't work that well).

I noticed a small mound in the sandbed and two tiny tiny antennae poking out of it. It's hard to see the mound in this video but the antennae are visible, they move around and retreat under the sand at the end (gsp for scale):

Probably nothing bad, but I'm curious. Does anyone know what it could be?

 

[vetteguy53081]

Not an anemone but rather a clove polyp
You can leave or because of their fast growth rate, cut away and discard

 

[Kaisentlaia]

Not an anemone but rather a clove polyp
You can leave or because of their fast growth rate, cut away and discard

I was talking about the tiny tiny antennae in the sand near the gsp. They're kinda hard to see but they're there.

 

[NoahLikesFish]

Mabye a worm I saw one in my plastic bag ecosphere