Are these eggs or something else?

[raysinette]

These showed up on my octospawn today. I’m assuming they’re some sort of egg. I have cerith and trochus snails.

 

[DDenny]

Colonial tunicates I believe.

 

[DDenny]

Oops double post sorry

 

[ISpeakForTheSeas]

Yeah, those are colonial tunicates- they're filter feeders, but some species can spread invasively and grow over pretty much anything (including corals and macroalgae).

They're neat and pretty, but, given the invasive nature of some species, if you want to keep them, I suggest isolating them on a rock separate from the main rock work and trimming them back as needed ok that rock to keep them contained.