Spider web stuff randomly showed up

[Briant87]

Anyone have any clue as to what it is sorry about the picture it's kinda hard to tell but looks like a really tight spider web

 

[BallinCrew10]

I recently discovered I have vermitid snails on my LR that make "spiderwebs", though mine aren't nearly as thick as yours. Also, if it were vermitid snails you would see small tubes growing on your LR.

http://www.xtalworld.com/Aquarium/hitchfaq.htm

 

[nxb161]

Royal Gramma?