Well found this today, looks almost like a tube worm thing such as feather dusters but it's not open like dusters. Maybe it's developing. I've never had any feather dusters added to the tank also. Also this is relatively new.
Originally Posted by Sooner_Reefer http:///forum/post/2875852
It hasn't moved and is it harmful?
they're not harmful .... but the mucous feeding webs they put out can be annoying.