What are these?

[neddis]

I found some new critters. can anyone ID them for me? The worm is against the plastic in the sand and the red thing is just attached to the side of the tank.

 

[Jennie]

First one is a bristleworm and the second might be a type of sponge.

 

[EDGRAY]

BINGO jennie bristle and kinda sponge i think is a Frilly Sponge!! anyways if the bristle to big and can take it out do it if not ..there is nothing to worry even if is too big will be as part of your cleaning crew :mrgreen:

 

[skipm]

The second pic looks like a small piece of macroalgae to me. Either way, sponge or macro, they are both good.

 

[djconn]

Yeah, 2nd pic looks like some kind of macro to me too. I'd just leave it in to add to your biodiversity.

 

[little urchin]

have a look here for other hitchikers
http://www.xtalworld.com/Aquarium/hitchfaq.htm