Snail or worm or…

[JdubC]

Any thoughts on what these might be?

They are attached to some live rock. They sway in the flow.

 

[Saltyreef]

Looks like sponge. Very small chance it could be hydroids but it looks thicker and more like sponge

 

[JdubC]

Looks like sponge. Very small chance it could be hydroids but it looks thicker and more like sponge

Was considering hydroids, but definitely seem thicker and not seeing any stringy tentacles.

Thanks for the response.

 

[EnterName]

Is there a way to get one of these things out with tweezers or so?

 

[JdubC]

Is there a way to get one of these things out with tweezers or so?

I’ll give it a shot and post a pic.

 

[JdubC]

They came right off. Here is a pic of two of them.

 

[EnterName]

They came right off. Here is a pic of two of them.

Okay, so they are branching, squishy, and green. This doesn't match any tube-dwelling worms I'm aware of.

There are no visible polyps indicating hydrozoa either.

Sponges that grow in branches usually have visible holes throughout the structure and are hollow. Example: https://reefbuilders.com/wp-content/blogs.dir/1/files/2019/10/sponge-coral-reef-3.jpg

If those filaments aren't hollow it just looks like algae weird.

I'm struggling to identify what kind of algae though. The filaments are really thick and I can't make out what these things are:

 

[JdubC]

They came right off. Here is a pic of two of them.

Okay, so they are branching, squishy, and green. This doesn't match any tube-dwelling worms I'm aware of.

There are no visible polyps indicating hydrozoa either.

Sponges that grow in branches usually have visible holes throughout the structure and are hollow. Example: https://reefbuilders.com/wp-content/blogs.dir/1/files/2019/10/sponge-coral-reef-3.jpg

If those filaments aren't hollow it just looks like algae weird.

I'm struggling to identify what kind of algae though. The filaments are really thick and I can't make out what these things are:

Thanks for this response.

I definitely have algae, so that makes sense. Glad it isn’t something more invasive or problematic.

I’ll keep an eye on it and remove as needed.