What is this? Worm, Nem? It’s so odd

[Andrewkg]

Noticed this in my sump the other day on a piece of live rock, anyone seen this before? If you watch the video you’ll see it retracts very quickly when nudged.

https://flic.kr/p/2qcszAc

 

[Reefaddict123]

Not an aptasia?

 

[Andrewkg]

Never seen it move that quickly, If you shine a light it turns towards it. Also seems to change the direction the tentacles are facing

 

[Sumbub]

Glass anemone. You should get rid of it. They can get out of control.

 

[Andrewkg]

Thank you, strange mover

 

[CristianBells]

Noticed this in my sump the other day on a piece of live rock, anyone seen this before? If you watch the video you’ll see it retracts very quickly when nudged.

https://flic.kr/p/2qcszAc

website
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It sounds like you might have encountered a species of bristleworm or another type of marine creature that retracts quickly when disturbed. These creatures are often harmless but can be a bit startling to spot unexpectedly in your tank!

 

[marrone]

Looks like an Aiptasia.

 

[Timfish]

My guess is a curlique anemone.

Curlique Anemone

Care Level: Beginner Minimum Tank Requirements: 15 Gallons Diet: Photosynthetic, Trace Elements Reef Safe: With Caution Temperament: Semi Aggressive

www.kpaquatics.com

 

[CristianBells]

Noticed this in my sump the other day on a piece of live rock, anyone seen this before? If you watch the video you’ll see it retracts very quickly when nudged.

https://flic.kr/p/2qcszAc

View attachment 366700
View attachment 366699

It sounds like you’re describing a classic bristle worm or possibly a peanut worm (Sipunculid) — both are common hitchhikers in marine aquariums and often reside in live rock, especially in the sump where it’s dark and safe.