What are these long tentacles or worms?

[Mlarson]

I have seen a few of these sticking out of the rocks so at first I thought they were part of a spagetti worm but now I have two of them that are attached to the glass. What are these?

 

[danieyella]

snail egg clusters, cerith lay in lines like that

 

[Mlarson]

snail egg clusters, cerith lay in lines like that

Ah, thank you very much!

 

[TDDredge]

+1 definitely snail eggs. Good fish snacks.