Yeah, it looks like the one in my tank. Its in the center hanging off the ledge on the left side next to my yellow milli. Look in my gallery. It is hard to get. I got mine through a good friend and has lineage to Tyrees original colony. I just recently fragged it and kept a medium sized piece for myself.
I am not fragging it again until it gets to a nice size again. But will keep you in mind when I do.
It looks just like the green slimmer only a bright dark blue, I saw one on liveaquaria's diver den but it was gone within a couple on min. and I've been looking for one since.