Purple thing on spiny astra shell

[Calvin96]

Can anyone advise me on what this is? It was on the shell when I got the spiny astra snail and has almost doubled in size?

 

[ISpeakForTheSeas]

Can anyone advise me on what this is? It was on the shell when I got the spiny astra snail and has almost doubled in size?

A solitary tunicate - harmless filter-feeder.

 

[Calvin96]

Thanks, so I am okay to leave it as is?

 

[ISpeakForTheSeas]

Thanks, so I am okay to leave it as is?

Yeah - it shouldn't cause any issues.