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

This popped up the other day. It's about 1/2" tall. Any idea? Thanks!

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I have a couple critters that need identifying. The first is hard to see in the pics, and hard to see in general because of where it's located in the aquarium. It looks like an anemone/aiptasia, but is fairly large and almost pure white. The tentacles are almost straight.

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The next should be much easier. They're in small "tubes" in the rocks, all over, and appear to be some sort of tube worm. They're white stringy things.

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What I'm showing in the pic is the stringy thing that's illuminated by my flashlight. I can take better pics if it's hard to see
 
mgrmax, no idea, take it out & put it in a bowl w/tank water for a good pic.
Litigator, 1 is aiptasia & 2 is probably spionid worms.
kingevil, asterina star, full grown.
Duo, sponge.
 
Great thread. Quick question, I've heard the occasional clicking in my tank for a few months now. I thought it was something in the filtration equipment but couldn't pinpoint the source. It's been driving me insane. With that said, it sounds like it could be a pistol shrimp, although I can't say I've seen one. How might I locate/trap/remove these guys?

46g BF 4 month old reef (no corals...YET).
 
Anyone know what this is? They have not harmed anything at all, I just want to know what kind of pod it is. If i dont clean the glass i see them by the thousands and when I clean the glass they fall into my Zoos & P's and they seem to love munching on them.
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mgrmax, no idea, take it out & put it in a bowl w/tank water for a good pic.
Litigator, 1 is aiptasia & 2 is probably spionid worms.
kingevil, asterina star, full grown.
Duo, sponge.

Thanks! I figured out what it was. A shell:headwally: and the whole time I was ready to name an undiscovered species after myself.
 
Does anyone know if munnid isopods are good or bad for a reef tank? a guy just gave me a bunch of them and said they eat algea but do they eat corals or fish? I'd like to know if I should keep them or throw them in the trash?
 
I've had my tank set up for 3 days, found about 5 of this concerning creature, so far, a little worried since I'm completely new to this. Any ideas or suggestions?

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Just because everybody needs to know a bristle worm when you see one: meet Sam. I lost him in a move, along with Frodo and two others called Fred and Barney. These larger ones tend to have one hole in one rock and to pretty well stick to it, but they are really great cleaners, and I greatly miss these 4. All my current ones are little guys.
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Is it possible that the bistleworm can hurt a fish if the fish goes in the area of the rock where the worm normally stays? I found my new tiger goby that was doing great by my worms hole dead and the bristle touching him not sure if the worm was trying to move him or not.
 
atomicenergy, it's a bristleworm. Good clean up crew.
St. Pete, doubtful. My goby sits on them sometimes LOL. Now if it's a eunicid, those can get very large and can eat fish when they're very large.
 
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