Pix & ID: Critters that come in your rocks: the good and the bad.

Does anybody know what this is? I just found this today on some zoas, looks like a spider? Good or bad?
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Please help me ID some corals!

Please help me ID some corals!

Hey guys!! I'm new to reefing, I've been running a 33g drilled nano for about four months and everything is going swimmingly!

I was hoping someone could help me to identify some corals I have. I know that some of them are zoos, toadstool etc, but I was hoping on clarification on exactly what they are.

Thanks!

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The third picture is zoanthids. (Radioactive Dragon Eyes) The last picture looks like a toadstool coral. (Sarcophyton) I'm not to sure about the first, second, and fourth picture. Sorry.
 
First picture isn't a coral it's an anemone. Possibly a long tentacle ... Macrodactyla doreensis. Second and fourth look like some species of mushroom.
 
Thanks for the advice on the anemone, that's definitely what it is (LTA).

As far as photo 2, it's some time of stony coral, so that one isn't a mushroom. I was told it may be some type of Aussie coral, and some that I looked up (Favia) look quite similar.
 
I'm wondering if I should take this rock out. I just picked it up at LFS. It came right out of one of their tanks. I see what may be an aiptasia, and the black stuff concerns me (slightly gives like aquarium epoxy) and their is a little red guy that comes out one of the holes. It does have some type of coral?, and amphipods on it so, what do you guys think?
 

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I'm still fairly new to the hobby (10 months) so I'm always learning something new. Last March I purchased my first colony of mushroom corals and at first, I did not notice the blatant hitchhiker. I also did not dip my corals because I wasn't aware that it was recommended to dip your corals before putting them in the display tank. Anyhow, I would say that after a week or so I noticed there was something organic living on the colony rock in plain view. I only noticed it because the "holes" closed up while I was observing the tank. I honestly thought it was harmless because it looks like some type of filter feeder but recently, I noticed green bubble algae growing on the surface so now I'm not so sure if I want this thing in my tank anymore. I was tempted to "rip" it off the rock and dispose of it but before I rush to judge, I thought I would consult with the experts. I appreciate your help!

I wanted to include a pic of the "filter" holes open and another pic of them closed. Since there are two holes (one in front and one in back) I wanted to send a pic of both angles.
 

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Nolabrr, looks like black spomge. I've had some for a couple years now with no trouble. The red guy, no idea, need a better description.

Drew, can't tell from the pics cuz I'm tired & using my phone, but the description sounds like a harmless tunicate.

I have pics of both things on my Homepage (click my name & the Homepage link).
 
Nolabrr, looks like black spomge. I've had some for a couple years now with no trouble. The red guy, no idea, need a better description.

Drew, can't tell from the pics cuz I'm tired & using my phone, but the description sounds like a harmless tunicate.

I have pics of both things on my Homepage (click my name & the Homepage link).

Thank you! It is a tunicate.:D
 
Looks like digitate hydroids. Pull out the chunk that they're on, they're not harsh stingers to corals, but they're irritants & if they get in your display you'll be living with them forever.
 
Looks like digitate hydroids. Pull out the chunk that they're on, they're not harsh stingers to corals, but they're irritants & if they get in your display you'll be living with them forever.

Thank you SushiGirl! That's what it is. Seems to be alot of different varieties of this stuff, that may or may not thrive depending on the tank. I removed it.
 
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