Hitchhiker ID: sponges?

[oakengineer]

I went to move some stuff around and noticed I hundreds of tiny white things attached to lots of stuff in the tank. What are they? They look like tiny versions of what I had previously thought to be sponges on my seed rock.

Things on rocks:
http://i.imgur.com/k1BLN6v.jpg

Things on bottom of overflow box:
http://imgur.com/ozWoRMr

"Full-size" version near top of this rock?
http://imgur.com/eiiTpAG

 

[Silvergryphon]

Yep, small pineapple sponges.

 

[oakengineer]

Well its good to know its something harmless. But for the record, I prefer when the invertebrate life in my aquarium doesn't go from 3 to >9000 in the span of a week.

 

[Silvergryphon]

LOL Sounds like me with these collonista snails.

 

[shesacharmer]

They will level out as your tank matures.

 

[Dr. Reef]

i agree with all above statements.