What is that!! A R2R guide to common new tank hitchhikers.

[AcanSweeper]

Help ID please! Peanut worm hopefully?!

 

[Crabs McJones]

Help ID please! Peanut worm hopefully?!

The tentacles at the end make me think Medusa worm

 

[Reefkeepers Archive]

The tentacles at the end make me think Medusa worm

Yes, or some other kind of cucumber

 

[AcanSweeper]

The tentacles at the end make me think Medusa worm

Okay thanks! Quick google search says they're beneficial detritus eaters phew

 

[yasmin1208]

Hi guys, any idea what this could be? Never moved out of this spot but looks like a claw either opened or closed, just snapped shut when bristleworm went near. Any help greatly appreciated!

 

[OrionN]

Hi guys, any idea what this could be? Never moved out of this spot but looks like a claw either opened or closed, just snapped shut when bristleworm went near. Any help greatly appreciated!

That is a man-eating Moray!!!!
Kidding aside, I think it is a bivalve of some kind. Filter feeder.

 

[Crabs McJones]

That is a man-eating Moray!!!!
Kidding aside, I think it is a bivalve of some kind. Filter feeder.

Agree

 

[Fredinva]

My LFS found this lil critter a couple days ago just as he was about to dip some new coral. I'm even surprised he saw it at all at bottom of his container. When he showed me, i immediately said baby aiptasia.
NOT!
I went home and got my Jewelers loupe (5X).
it is about 1/8inch across, with about 12 or 13 arms(tentacles). It was firmly attached to the bottom of the plastic cup. But while taking a video, it crawled just like an octopus and moved about a 1/4 inch.
Ive done a bit of searching(googling) and cant find anything quite like it.
okay people, what ya think?
The video only shows 9 or 10 arms, but there are 12 or 13!!

 

[Reefkeepers Archive]

My LFS found this lil critter a couple days ago just as he was about to dip some new coral. I'm even surprised he saw it at all at bottom of his container. When he showed me, i immediately said baby aiptasia.
NOT!
I went home and got my Jewelers loupe (5X).
it is about 1/8inch across, with about 12 or 13 arms(tentacles). It was firmly attached to the bottom of the plastic cup. But while taking a video, it crawled just like an octopus and moved about a 1/4 inch.
Ive done a bit of searching(googling) and cant find anything quite like it.
okay people, what ya think?

I think we can safely rule out any arthropod, dosent look to be any hydroid I've ever seen, I don't think an anemone would get detached like that and it dosent appear to be a starfish of any kind. You have me stumped! It kinda looks like the feeding arms of something like a Medusa worm or other cuke, which would be my closest guess. @ISpeakForTheSeas @EeyoreIsMySpiritAnimal?

 

[ISpeakForTheSeas]

My LFS found this lil critter a couple days ago just as he was about to dip some new coral. I'm even surprised he saw it at all at bottom of his container. When he showed me, i immediately said baby aiptasia.
NOT!
I went home and got my Jewelers loupe (5X).
it is about 1/8inch across, with about 12 or 13 arms(tentacles). It was firmly attached to the bottom of the plastic cup. But while taking a video, it crawled just like an octopus and moved about a 1/4 inch.
Ive done a bit of searching(googling) and cant find anything quite like it.
okay people, what ya think?
The video only shows 9 or 10 arms, but there are 12 or 13!!

I think we can safely rule out any arthropod, dosent look to be any hydroid I've ever seen, I don't think an anemone would get detached like that and it dosent appear to be a starfish of any kind. You have me stumped! It kinda looks like the feeding arms of something like a Medusa worm or other cuke, which would be my closest guess. @ISpeakForTheSeas @EeyoreIsMySpiritAnimal?

Looks like it may be a very small Swimming Anemone, Boloceroides mcmurrichi. For a fairly similarly sized specimen to compare with:

The Biodiversity of Singapore

 

[Reefkeepers Archive]

Looks like it may be a very small Swimming Anemone, Boloceroides mcmurrichi. For a fairly similarly sized specimen to compare with:

The Biodiversity of Singapore

I'll remember that for next time! Forgot about swimming nems

 

[Fredinva]

hey, ispeakfortheseas!!! you may have something there, i will check further tomo.
thanks