What's this mucousy/spider-web stuff in my LR?

[bpeitzke]

A couple of weeks ago I noticed these "spider-webs" in one of my LR pieces. They look like they're made of some sort of mucous. Anyone know what critter made these? (See attached picture)

Bob

 

[Erok7620]

I've seen that on much of my rock as well. My rock came from an established aquarium and I assumed it was part of a former inhabitant like a shroom or a sponge, or just some funky algea. I would like to know too. Help us experts!

 

[cmor1701d]

Take look at this video of vermited snails. I can't really tell from the pic you posted but it could also be sponges, foraminiferans, or spaghetti worms.

 

[roka64]

I'll move this to the ID section.

 

[Devilishturtles]

I agree, looks like a sponge to me. I have these all over my tank.