What is this?

[Tigershark22]

Howdy!
New reefer, just curious what this is growing on live rock shelf.

Tank is only 3 weeks old, cycled, and parameters are good. I’ve just been watching the assortment of algaes compete at this point but also seeing new growth in coralline and various others that I’m not too familiar with.
This one being all alone just caught my eye.

It’s brownish green, about the size of a fingertip, bulbous and speckled in the center of the “bulbs” (not sure if those are various polyps of sorts).
Any ideas?
I apologize for the photo quality

 

[Dburr1014]

Um, it's that a boat in your tank?
What is it made of? Probably won't be good in tank for a long run.

Could be a black sponge growing.

 

[Tigershark22]

Um, it's that a boat in your tank?
What is it made of? Probably won't be good in tank for a long run.

Could be a black sponge growing.

That is indeed a sunken wooden model ship. Also shot up with a .22 to appear battle worn . I’m a fan of realism and manufactured aquarium decorations weren’t it lol.
I didn’t undertake the project lightly though. I was aware of potential risks and have been as diligent as possible to make it reef safe.

The wood of the ship has not been stained, but rather painted with acrylic paint and glued with acrylic based glue. The only thing I was uncertain about was what the sails & strings have been dyed with.
So as a precaution, I sunk the ship in RO water for a month before setting up the tank.
Follow my build thread if you’re curious how it goes. I’ll certainly be posting updates on it, good or bad

 

[ISpeakForTheSeas]

That's a colonial tunicate species of some kind - they're filter-feeders, but some colonial tunicate species be invasive to the point of growing over healthy corals, algae, etc.

So, I typically suggest isolating them on a rock separate from the main rockwork so you can easily control their spread.

 

[Tigershark22]

That's a colonial tunicate species of some kind - they're filter-feeders, but some colonial tunicate species be invasive to the point of growing over healthy corals, algae, etc.

So, I typically suggest isolating them on a rock separate from the main rockwork so you can easily control their spread.

Awesome, thank you for the info!