Help with ID

[deville n reef]

What in the world is this growing on my glass ...?
Haven't seen anything like it before.

 

[Shep]

@twilliard @Lionfish Lair

 

[Lionfish Lair]

What does it move like?

 

[SantaMonicaHelp]

Do you notice it feeding off of anything? Or have you noticed any behavioral change in your tank?

- C. Smith