[Go Lions!]

Hey everyone, a month ago I picked up a couple new pieces of LR and a few days later I also discovered the most revolting and thoroughly repulsive looking creature I've ever seen in my life that came with it. Could anyone help me determine what it was? It appeared to be a shrimp of some kind that was about 2" long, dark gun-metal grey almost black, about 8 pairs of legs up near the front and a fairly weak exoskelaton throughout. It's width was the same throughout the length of it. ((I'm not 100% sure if this is related but... the day before I found it, I noticed a couple of disgusting looking 'flegm-like' secreations stuck on the liverock that I ASSUME?? was from it.)) Basically it almost looked like someone with a bad cold blew their nose into the tank. What is more frightening is that I'm still discovering these 'secreations' every few days, and I fear that anotherone may be hiding somewhere in the tank. For now I'm just hoping that IF there is another one in there that it will have a quick and fatal introduction to my Triggerfish. Does anyone know what this thing was? Should I take more of an active intervention than this? What are your experiences with this!! thanks!