What are these clear Tube like things?

[elite01]

I've had this rock in my sump for a couple of months. There doesn't seem to be a mouth for them and they just branch out from the original tentacle.. what are they?

 

[mikenh77]

Looks like a common type of hitchhiker sponge. I wouldn't be worried about it.

 

[madjoe]

Looks like a common type of hitchhiker sponge. I wouldn't be worried about it.

+1

 

[elite01]

Oh cool, thank you guys

 

[jrpark22000]

+1 on the id. I tried ridding the tank of what looks very similar, to no avail. After time they have all but disappeared. If the tubes are very soft, easily broke, have a white/gray or even slight pinkish hue, preferring to live in the shade with an occasional spire sticking up into the light, you have a sponge HH.