ID help/little sack looking things

[hoseman77]

I found these also under my powerhead and there is one under some live rock. It looks like a tube or sack that is white with a hole in the center of it with fuzzy outside.

 

[renogaw]

odd type of sponge, does it look like a qtip sponge from the side?

 

[spanko]

scypha ciliata, q-tip sponge.
Here is a picture for comparison.

 

[hoseman77]

thats it. So are these harmful?

 

[spanko]

nope harmless. They proliferate in areas of high flow and darkness and high nutrient.