What are these white things?

[BarryRey]

I have a NC28 and these white things are all over in the back chambers along with starting to attach to my live rock in the display. They look like small grains of rice with what looks like feelers on the end but they do not seem to move. These aren't the best pictures but hopefully someone can help identify them. I never have them on the display glass although they are stuck all over on the back chambers.

http://i1137.photobucket.com/albums/n501/barryrey/Whitethings3.jpg

http://i1137.photobucket.com/albums/n501/barryrey/whitethings4.jpg

[tankfly]

they are a type of sponge, harmless.

[NanoReefWanabe]

pineapple sponge, great filter feeders

[BarryRey]

Thanks for the replies, did a google on pineapple sponge and those are definitely them.