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

Found this guy hanging out in my coral today. Never seen him before. What is he?

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What has started growing out of my live rock? I figured this was just a dead sponge but it's growing this white stuff and the tips glow under blue light. It has polyps now too. (Sorry if that's the wrong word, still learning!)

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Thin, white-ish nearly clear worm?

Thin, white-ish nearly clear worm?

Can't quite id these guys. Have several, don't seem to bother anything. Pretty long, 2" or better. Super thin, white-ish but very transparent. Can't identify a head/tail/etc. Just a threadlike worm. Seem to hang out in pairs on the rockwork.
 

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I adore this thread. I've learned so much from reading it.

Perhaps you can help me with this one? Surrounding the feather duster, the tiny white tubes with their tiny white (and a little red) heads? Hydroids? Baby jellies? Tiny feather dusters? They don't quite match up with google searches for any of those things, I I'm thinking something else I've yet to learn about?
 
i know this picture sucks, but i was wondering if you are able to see what i have drawn a box around and help me ID them? i just noticed them all over the sanded of my tank.

thanks.

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I adore this thread. I've learned so much from reading it.

Perhaps you can help me with this one? Surrounding the feather duster, the tiny white tubes with their tiny white (and a little red) heads? Hydroids? Baby jellies? Tiny feather dusters? They don't quite match up with google searches for any of those things, I I'm thinking something else I've yet to learn about?
Tiny feather dusters.
 
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I adore this thread. I've learned so much from reading it.

Perhaps you can help me with this one? Surrounding the feather duster, the tiny white tubes with their tiny white (and a little red) heads? Hydroids? Baby jellies? Tiny feather dusters? They don't quite match up with google searches for any of those things, I I'm thinking something else I've yet to learn about?

Maybe these links will help.

http://reefkeeping.com/issues/2003-05/rs/

http://www.advancedaquarist.com/2002/8/inverts
 
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Taricha,

Would you say those are calcerous tubes? Prior to our new tank, I had zero interest in taxonomy, but now I am geeking out big time.

They are certainly not in as much of a tangled mass some in the pictures from this website, but I'm thinking the Sagebrush tube worm might be a candidate.

http://http://www.sealifecenter.com/biology/biology.php?langue=uk&action=detail&bio_id=80
To find out if they are calcerous, push on them, if they collapse and come back, then no - that's like colonial hydroids. If they break off, then yes.

I'm saying they are calcerous because mine that look just like that are.
 
Strange orange vine organism.

Strange orange vine organism.

can anyone id this for me it has been here for a few months now since i added some new rock and just hangs out on the glass in relatively the same spot give or take a few inches..... it has also split off into a few other strands but they quickly vanished within a day or two... the vines coming off of it do seem to change positions every so often usually within a hour or less. cannot for the life of me figure out what it is or if it is possibly a problem?
 

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

What in the world is this?! Tanks been up for a couple months and it's the first time I've ever seen it.
Warning* some possible explicit music in background. Mute video or don't watch if you don't want to here it.
First two videos are okay:https://vimeo.com/146517558 https://vimeo.com/146517614
Third video has illumination, but the thing in question is more curled towards the camera the while time (possible reaction to light?) https://vimeo.com/146517707
Forth video is for scale. I take the macro lens off and pan out, taped to the tank is a dime for size reference. The rock it's next to/under is a little smaller than a marble. https://vimeo.com/146517820

Edit:
Tapatalk compressed the videos and they lost a good amount of detail. Sorry.
 
Sea slug filter feeder?

Sea slug filter feeder?

Hi :-) only been at this 3 months and loving every minute. Found this awesome lil guy in the tank last night. Been trawling the net and wondered if anyone Knew exactly what it is? Its a slug for sure :-) but what type and is it a nuisance in a reef setup?
 

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Hi :-) only been at this 3 months and loving every minute. Found this awesome lil guy in the tank last night. Been trawling the net and wondered if anyone Knew exactly what it is? Its a slug for sure :-) but what type and is it a nuisance in a reef setup?

Nudibranch. Recommend you get him out ASAP, at least until you can positive ID.
 
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