Thanks everyone for your help. Since I am not emotionally attached to the little fellow, and I am attached to a few other things in my tank...he is exiled for good. Better safe now, then sorry later.
This little fellow decided to come out of the rock. I have been trying to keep an eye on him for about a week. Nothing is missing but the tank is still relatively new. He is now in quaratine until we can get a verdict.
Thanks for the information. I believe you are correct. I just recently purchased the remaining LR to place in the tank and a couple of those piece also have one of those nasty things in them. I could have done without that ugly mess.
A brief introduction. I just set this tank up a week ago, and it is my first attempt at a coral reef tank. I have had freshwater tanks for about 20 years. This creature only comes out when the light are off and the tentacles reach lengths of up to 10-12 inches. This came inside the rock and I...