omg what is this thing

look like a Giant Feather Duster

Info on it

The Feather Duster uses the radiole to filter out small floating organisms, which it directs toward its mouth, located at the center of the crown. It protects its segmented body by secreting a parchment-like tube to cover itself. When it is disturbed, it can quickly pull in its radiole into the tube. If it is severely stressed, it will discard its crown, growing it back later.

The Feather Duster is usually found in the coral rubble at the base of the reef aquarium, with some of the rubble being incorporated into its parchment-like tube. It needs to be housed in a well-established reef system as it is dependent upon plankton for its diet. It is very intolerant of copper-based medications.

Supplemental feeding of phytoplankton and liquid organic foods should be provided.
 
I don't think it is from the water. I think it is something that fell in like a seed or something. Besides you already heard it from the top invert ID expert on here LeslieH and I guess she isn't even sure what it is.
 
do you have any clams by any chance to me it kinda looks like a clams foot and the strings that stick on rocks under the clam. anyone else or am i just crazy?
 
its deff not a seed because u can see it is all white and the middle looks like the foot. when you touch it its slimy and the stuff is real hard to rip off? most likely a clams foot.
 
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