What is living under my Rhodactis?

[907_Reefer]

So I noticed multiple wormy, tentacles spreading from underneath my Rhodactis today. I've seen 3 at once, they extend an inch or more, flow in the current, when I lightly bump the mushroom it retracts and exposes what appears to be a worm tube.. Rhodactis seems fine and dandy. ID please and thanks!

 

[Daenion]

Those look like hydroids to me. But there are people with much better knowledge than I possess

 

[907_Reefer]

Ugh..

 

[907_Reefer]

I wonder if my new friend @EeyoreIsMySpiritAnimal can help confirm..

I've done some research this morning, can't really match it to any of the hydroid photos I've found, unless it's just hiding in the tube with a few tentacles out at a time. They do extend pretty far, over an inch from the tube or so, when not retracted. With the tank still dark now, I can see the tube and one of the tentacles floating around about 1 cm out.

Luckily this is the only place in the tank I've noticed, on my newer Rhodactis frag still on the rack - thinking I can pull it today and scrape the tube off with a knife maybe..

 

[EeyoreIsMySpiritAnimal]

Is the tube make of sand? If so, they are Phyllochaetopterus or Chaetopterid worms - harmless filter feeders similar to spionids.

https://reefkeeping.com/issues/2003-05/rs/index.php

Regardless, they're definitely not hydroids

 

[907_Reefer]

Is the tube make if sand? If so, they are Phyllochaetopterus or Chaetopterid worms - harmless filter feeders similar to spionids.

https://reefkeeping.com/issues/2003-05/rs/index.php

Regardless, they're definitely not hydroids

Thanks!!

I'm not sure on the tube yet, it does look similar to my feather duster shells though.

My only note against a Chaetopterid worm is that I'm pretty sure I've seen 3 tentacles out at once, will keep an eye on it today however.

And will get some better pics once the lights are on. Appreciate the help!

 

[MAH]

Those look similar to Spionid worms.

 

[vetteguy53081]

So I noticed multiple wormy, tentacles spreading from underneath my Rhodactis today. I've seen 3 at once, they extend an inch or more, flow in the current, when I lightly bump the mushroom it retracts and exposes what appears to be a worm tube.. Rhodactis seems fine and dandy. ID please and thanks!

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This is clatharina sponge and will spread. Take a tweezers and carefully pull off and discard. You can also place frag in a container of tank water and be sure to scrape it all off. Not spinoids which utilize two palps- not one for feeding