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

Is this aptasia? Never seen it colonize like this before
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Here's one that needs an ID. This came in on the side of a lobo brain. It's only about a 1/2" long and just looked like red coralline algae at first, until I noticed that each end seems to extend when the lights go out, and retract really quickly when you flash a light at it or tap on the glass. It appears to be some sort of filter feeder, but I've never seen anything like it before. I've had it for about a month and has never moved.

I just got a new camera and was able to really zoom in on it. Any ideas?
 

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DSinSoCal said:
Here's one that needs an ID. This came in on the side of a lobo brain. It's only about a 1/2" long and just looked like red coralline algae at first, until I noticed that each end seems to extend when the lights go out, and retract really quickly when you flash a light at it or tap on the glass. It appears to be some sort of filter feeder, but I've never seen anything like it before. I've had it for about a month and has never moved.

I just got a new camera and was able to really zoom in on it. Any ideas?
Click to expand...

It's probably just a Tunicate of some sort. (harmless)
 
Is this one of the good or bad guys?

Is this one of the good or bad guys?

Sorry i couldn't get better pictures but this guy as soon as I turn on the lights goes into his hole! I see that next to his hole in the rock is getting clean from algae, but... this is my first week cycling this tank, what's gonna happen when I get corals in it? Will this worm or whatever it is going to cause me problems?
 

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JuanManuel said:
Sorry i couldn't get better pictures but this guy as soon as I turn on the lights goes into his hole! I see that next to his hole in the rock is getting clean from algae, but... this is my first week cycling this tank, what's gonna happen when I get corals in it? Will this worm or whatever it is going to cause me problems?
Click to expand...

A more experienced posted might know better but it looks like it could potentially be a Eunice worm to me. What does its head look like? If you can get a pic of that or describe it, I imagine that would be helpful.
 
JuanManuel said:
Sorry i couldn't get better pictures but this guy as soon as I turn on the lights goes into his hole! I see that next to his hole in the rock is getting clean from algae, but... this is my first week cycling this tank, what's gonna happen when I get corals in it? Will this worm or whatever it is going to cause me problems?
Click to expand...
Bristle worm. I like them, but different opinions out there. Add long add there in check no real problems.

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Corey212J said:
Hi guys,

So i have another query....
I have discovered a stowaway crab in my LR. The only problem is he is very skittish, and dives back into the rock whenever I walk near the tank, so it is impossible for me to get photo! He is red /brown with quite large black tipped pincers..

anyone got any ideas what type of crab this could be? im struggling to find anything, and because i cant get a decent look / photo of him its even harder!

thanks in advance
Click to expand...
Look up strawberry crab, stone crab and red rock crab. All 3 are US native and strawberry is from Hawaii

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AlSimmons said:
What exactly are you referring to? That picture is so big that I'm not sure where to look.
Click to expand...
Sorry, I use mobile phone so pics are normal on my phone.
Have redone the pic and circled what I saw this morning. It seemed to be quite fleshy stuck on the back wall.
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Both the coral? And the snail came with my live rock. I'm honestly not sure what either are. The snail seems to have a tongue that's sticking out.
 

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