Need help saving a Hitchhiker's life!

AtomHeart

New member
I ended up with a lot of hitchhikers on the one piece of live rock I put in my tank, to seed the rest of my dry rock...I felt bad because I knew that since I was curing dry rock in the tank, most of these hitchhikers were going to be wiped out by the oncoming storm of ammonia...but amazingly, nothing died.

I have a serpent star, or brittlestar...a crab that now lives in my refugium, some hydroids, some kind of zooanthus or mushroom anenome that looks like a little satellite dish that aims at the light source...and then this purple slug-like thing. I believe the purple slug is some kind of nudibranch or sea cucumber, but I'm not sure.

It is dark purple and reddish purple, which is the exact color of the coraline algae on the rock it rode in on. It has 5 flat sides to its body, and each flat side is separated by a faint row of fleshy hairs. Here is a slightly blurry picture if it will help anyone ID this creature:

nudi2.jpg


When I saw that this creature lived through the ammonia spike, I felt like it has a fighting chance, even though my nitrite and nitrate are both through the roof right now. I figured if it was tough enough to survive this cycle, I'd welcome it into the new tank, but then tonight, I saw something I couldn't believe. This slug found itself a nice spaceous hole to lounge in, and it's head opened up, and out came 6 antler like branches making it look like a flower. These branches were clearly for sifting food out of the water column, as it would periodically take each of the six branches and wipe it through its mouth which was at the center of the flower. I was completely blown away...to shocked to think about getting the camera.

I now really want to keep this fellow alive if at all possible...its one of the most beautiful things I've seen in an aquarium. My questions are:

1. What is this thing?
2. Does it stand a chance of surviving the Nitrite?
3. Will it starve? What does it eat? Can I Feed it without wrecking my cycle?

Any help on keeping this fellow alive would be greatly appreciated.
 
Well, sadly, the little guy succumbed to the nitrites last night. I found him this morning curled up in a hole and he appears pretty dead...

Here's my question and fear...if it was in fact a sea cucumber, do I need to worry that my whole tank is now poisoned before I even got it up and going?
 
I got the rock from Aquamartonline, here in Denver. They have a great website, but it doesn't show any live rock, so I'm not sure if they ship it or not. I had this one pulled from an established tank, and drove it to my tank in about 15 minutes, so there was no die-off.

I purposely bought the most bare peice of rock I could find there, because I just wanted the bacteria and coralline algae, but it turns out I got amphipods, isopods, copepods, a small 1" crab, a sea cucumber, 2 serpent stars or brittlestars, 5 featherduster worms, a mushroom anenome, 3 hydroids, and a tiny little snail. So much for barren rocks. Haha. My cycling tank is brimming with lifeforms.
 
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