IDing few things

[hadarush]

few weeks ago i bought a live rock with some mushrooms and zoas on it
several days after it i discover that the rock is a big clam[4]..
i also found a big gray thing that i think is a sponge[1]
there is also a yellow thing with two "mouths" that i dont have any idea what can it be[2]
and can you please id which kind of mushroom i bought??[3]

 

[Anonymous]

1. Indeed looks like some kind of sponge. I've had very similar types growing in tanks, usually in low light, or unlit areas of the tank.

2. With an incurrent and excurrent siphon might be some kind of ascidian (sea squirt) or another variety of sponge. See if it responds to touch - a rapid retraction of the animal would indicate possibly a sea squirt. If it doesn't then probably a sponge.

3. No idea on the exact species but looks like something in the Discosoma genus from what I can see.

4. Might actually be an oyster - try spot feeding with a variety of liquid suspension foods if you want it to live. Otherwise it will likely eventually starve.

Hope that helps.

 

[RickFite]

Can I ask where you got that rock (oyster!). It's awesome! Exactly the kind of thing I'm looking to stock in my system. Sessile invertebrates fascinate me!

Thanks!