What's this on live rock

[giz1007]

Hi all
Hoping u can help me have tank running for about 24 months
Put dry rock in when starting tank
Now see these prickly things on the rocks not sure what it is or should I be concerned?
They break off to the touch just concerned if there's something untoward going on!
Thanks for the help


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[AlSimmons]

They look like the remnants of either Vermetid snails or Spionid worms. If they're dead then it's nothing to worry about, but a bunch of live ones in a tank could become a problem. They are known to irritate some of the things they come into contact with.

https://www.lionfishlair.com/hitchhikers-guide/

 

[Rover88]

Some of those look kinda like sponges to me, but they wouldn't be 'breaking' if thats the case.

 

[Anemone]

Yep, vermetid snail tubes. Careful, they can cause a puncture wound that gets infected if you're not careful when in the tank around them.

Kevin

 

[j.falk]

Careful, they can cause a puncture wound that gets infected if you're not careful when in the tank around them.

Kevin

Truth!

I hate those things. Especially when they go through your fingertips!