Tentacle coming out of my live rock!

[nanoman95]

Hey guys

So we are a good few weeks into the 20 gallon and I have 6kg of live rock tank mates are Nasarrius snail, 2 red legged hermits and a turbo snail who is doing a great job on the algae clean up. The rock is covered in copepods but I noticed a weird tentacle earlier!

There was a small pellet of food and a tentacle (slim, white) reached out felt the food and pulled it into the rock…it was only around 1cm long from what I could see but now I’m terrified for the hermit crabs as they are so small!

Anyone have any ideas who the tentacle could belong to?

 

[OctaviusBrine]

A picture could help. Hard to say without seeing it.

 

[JoJosReef]

Probably brittle starfish. Nothing to worry about. If the tentacle didn't look bristly (smoother), it could be a serpent starfish. Would need a pick to confirm.

 

[nanoman95]

Really struggling to get a pic cause it’s so small and in the most awkward rock piece (typical) I’ve been sat for hours tryna get a vid but it’s so unclear! Definitely looks smooth and white

 

[Jesse Sunday]

Could it be a small bristleworm? I have a bunch of them, and the smaller ones could look like a single tentacle. They're VERY fast at finding food that sinks down to them.

 

[ISpeakForTheSeas]

Possibly a peanut worm (Sipunculan)?

 

[mww00ds]

Could be a brittle or serpent starfish. They both tend to live in crevices and holes in live rock. And the only time you see them is when they reach out for some kind f food. Both are reef safe and are a excellent part of any CUC