What is this?

[JHanson]

 

[Reefing102]

Looks like a sand tube created by a worm

 

[JHanson]

Good or bad? always interesting, as the tank is over a year old cycling and besides fish (and a cleaner crew) a few months ago..only food added

 

[JTP424]

Look like a string of snail eggs. No harm. They may grow.

*Edit, if on wall of tank, if pulled from sandbed then I agree sand tube from worm.

 

[kevgib67]

My nassarius snails often have a mucus string the pull along with sand stuck to it that looks similar.

 

[JHanson]

Good snails to have, look forward some newborns!
Thanks for the feedback!

 

[EeyoreIsMySpiritAnimal]

Definitely not nassarius eggs. Do you have cerith snails?
And, regardless of the type, the eggs will quickly become snacks for your fish

 

[ptrick21186]

My nassarius snails often have a mucus string the pull along with sand stuck to it that looks similar.

+1. My Nassarius snails leave behind a trail of snot that usually picks up little bits of the sand like this