2 ID's Please!

[pr0teus]

Hi all,

Just wondering what these were:
1st pic- see the little tube in the area of the yellow circle. it's got a white long tentacle sticking out. what is this?
2nd pic- what is this big white thingy under my rock? is it a type of sponge?

thanks for looking.

 

[Anonymous]

Sponge and a dietritus eating worm.

I dont know what the worm is called but its a good thing.
Both of those things are good dont worry

 

[ricky1414]

that's one large sponge in the top pic. how big is he?

 

[pr0teus]

oh it's huge... there's like a small colony of them underneath that rock. i remember i saw it a long time ago and it wasnt that big (like a year or so ago). i just redid the rock arrangement in my tank and found it still there. i'll take more pics next time i'm fiddling with my tank.