What is this??? In my sump?

[hfp75]

I have a 12G Nano and in the back there are 3 sections for the sump.

I was doing some maintenance today and as I pulled out a bag that has "Matrix" in it these little worm'like things were on it and I have no idea what they are....

Can someone ID these things? They are about 1/2 a CM long.....



lastly are they good or bad?

Here are 2 pics....
http://i101.photobucket.com/albums/m...5/IMG_0533.jpg
http://i101.photobucket.com/albums/m...5/IMG_0529.jpg

[bignose]

looks like small sponges you'll probably see many of them in your sump

[mohammadali]

its sponge and some dust dont worry its not dangerous for the tank
in side my tank is full of this sponges and dust but its better to clean the dust of ur liverock

[daplatapus]

Yeah, the second one almost looks like they're pineapple sponges. Hard to tell for sure with them out of the water.

[Norstar]

You mean that's where Sponge Bob lives???? WOW!

(Couldn't resist )

[christyf5]

pineapple sponges, they like the dark. they're helping filter the water for you