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

Can anyone help me ID this thing? It's been hanging in this spot for a few days now. Bad? Good?
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Found a hitchhiker crab in my tank today. I am assuming bad crab, because it has hairy legs and (only one) pointy claw. It's body is the size of a penny (there in the bowl for reference.)

Its already in the sump, but for curiosity sake, what type of crab is it?

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My rock has developed this hairy looking algae?
Not sure if you'll be able to see it but it is all over the rock and no one is eating it. Had it a couple weeks or so.
 

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I know these guys are stars, just wondering if anyone is able to ID them with just pictures of their legs. The legs are banded, looks like red and white maybe?

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Brittlestar for sure, perhaps not so micro. I have a few of these in my tank. One has stuffed itself into a hole under my Kenya tree and persists in irritating it. I tried to lure it out to find that it was quite large. With legs spread, approx. 2 - 2 1/2" in diameter. Looked much smaller when just the tips of its legs stuck out, much like in your photo.
 
My previous post did not show the pic, hopefully this works.
Looks kinda hairy, always attached to hard corals.

Cymo andreossyi : Very common and is considered a coral symbiont, with the caveat that such symbiosis are a trade off between the coral and the crab, the coral gains protection and house cleaning services while giving up a few polyps, mucus and captured/settled food particles in exhange for those services. A healthy coral should have no problem repairing or replacing lost polyps, but again, in an aquarium environment, an eye should be kept on the coral for excessive damage being done due to the coral being unable to recover as fast or faster than the damage being done by the crab. In short, its a judgement call that you will have to make.

-http://www.chucksaddiction.com/hitchcrabs.html
 
ID Please. What type of snails are these? They are living in my sump.

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This may actually be a juvenile Stomatella, but I've never seen one with the white dots. That's usually an indicator it's something else...like, a Synaptocochlea. The shells are extremely variable, but often show white dots or dashes. They are in the same family as the Stomatella snails, but are smaller as adults and tend to be more cryptic.

http://www.gastropods.com/7/Shell_2007.shtml

Cheers,


Don
 
Brittlestar for sure, perhaps not so micro. I have a few of these in my tank. One has stuffed itself into a hole under my Kenya tree and persists in irritating it. I tried to lure it out to find that it was quite large. With legs spread, approx. 2 - 2 1/2" in diameter. Looked much smaller when just the tips of its legs stuck out, much like in your photo.
I agree on the not so micro. I pulled a rock out last night to tone down my aqua scape and dipped it in so RO to make sure I wasn't going to lose any little guys. Well one fell out of the rock and he was an easy 2 inches with his legs spread. I must have quite a few of these guys in my tank.
 
Hi - could I get an ID on this growing on a few small area of my rock. It looks tube like with small feathery like hair that moves with the flow. They seem to be gorwing in small patches but have taken months to get to the size of this one.

Thanks!

Sorry in advance for poor IPhone pics....
 

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