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

Was doing my occasional night time recon and noticed a round flat rock I didn't recognize when I tried to pick it up it started moving. It's movement was like water flowing. When it stopped it was shorter and more round. When moving it elongated. It was thin enough you could see the sand through it as it moved. Here's a video. Good or bad?

http://s47.photobucket.com/user/huntindoc/media/aquarium/hiker8-3_zps6cc14881.mp4.html

Looks like some type of polyclad flatworm. They're nocturnal predators. Some have been known to kill clams and snails.
 
worms?

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The mystery claw thing in a rock

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Help identify a fish hitchhiker

Help identify a fish hitchhiker

Hello, cleaning out my sump a few days ago I was shocked to find this 1" fish. Have no idea how he got in my tank. Last liverock was put in about 6 months ago and thoroughly cycled before it went in my tank. Any corals I've purchased get dipped and quarantined so I doubt its from my purchases. This is the best picture I can get. It's kind of a golden yellow with vertical bars. It kind of resembles a young tiger goby or a few other types of goby by its marks and its top fins but it is not a bottom dweller at all. Spends most of its time in the upper half of the tank since I moved it out of the sump. Fins on the bottom do not look like any of my shrimp gobies. In case it's an offspring of something I already have, I'll list the variety of fish in this tank. Blue damsels, yellow tail damsels, pink spotted watchman goby, yellow watchman goby and a juvenile 6 lined wrasse. Also have 2 tomato clowns. I've checked the sump thoroughly and there are no other fish found. I believe he was in the sump a fairly long time as it was unbelievably hard to net him. He knew every square inch of my 4 chambered 25G sump. He could go from far left chamber to far right chamber in seconds and that means going through all the baffle plates. Seemed to know every square inch. Any ideas would be greatly appreciated.
 

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Nudibranch

Nudibranch

Found this guy in my tank this morning. Zoa-eating nudi, or some other kind? Thanks, MB

(Hope I managed to properly attach the pic.)
 

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Found this guy in my tank this morning. Zoa-eating nudi, or some other kind? Thanks, MB

(Hope I managed to properly attach the pic.)

A zoa-eating nudibranch would be my guess as well. I would get rid of it just to be safe. Also, keep your eyes peeled for more. Usually when there's one there's more. As soon as the lights come on in the morning is a good time to start checking the corals for other nudibranchs. Just siphon out what you find. GL.

http://www.lionfishlair.com/hitchhiker/aeolid.shtml
 
Hokies, the top worm looks a bit like a peanut worm, 2nd pic, no clue...especially without any kind of behavior description.

Dectr6, not all gobies are bottom dwellers. You could pore through fishbase.org for gobies, but it's time consuming. Sorry, I'm not good at fish IDs.

Morten, if you found it on zoas, it's likely a zoa-eater. Hard to tell from that pic, but it's the general shape (not that that's always something to go by).

Hogfan, always capture, then take pics, then release or destroy LOL!
 
The claw moves up and down hole, never comes out.

My dad tried to pull it out with needle nose pliers and the claw thing broke which makes me think its not a crab.

Better pic

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Recently moved some rocks around to make room for a larger one and found about 5 or 6 of these bright red worms, are these guys good or bad? Crappy pic I know, but he just would not sit still!!
 

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Recently moved some rocks around to make room for a larger one and found about 5 or 6 of these bright red worms, are these guys good or bad? Crappy pic I know, but he just would not sit still!!

It's probably just a harmless bristleworm.
 
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I found this tiny anemone looking critter on one of my live rocks. Is it a corynactis?
 

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