well, whatever it is, it came with the tank and lr and everything that i got as a package, when i got it, this was nothing more than a tiny little speck on a rock, when i moved the tank it went into hiding, and now after a few weeks, it's come back out again in a new location(different from where i put it when i set up the tank. and its bigger now that ever before, so either i never saw it opened all the way, or its growing, and since no one can give me a solid identification, i'd rather not take a chance, its on a small chunk of LR, so i'm just gonna pull the whole chunk and be done with it...
I did find a real aiptasia comming out of a hole in a crab shell that i got from the lfs, when i found it, i pulled the whole shell out and put it in the trash, and then immediately called the lfs and told them... that way if they didnt know they had them, they do now. I felt it was the right thing to do, i didnt yell or get upset, just said, "hey i was in today and got some crabs and snails, and picked up one crab shell that didnt have a crab in it, but an aiptasia" the guy that answered the phone said, oh crap, ok, thanks for letting us know, and that was the end of it...
so unless someone can give me a really good reason to keep this whatever it is, the rock it and whatever else is on it goes away tonight when i get home, i'm not takeing a chance on chemicals or shrimps or anything till i see more of them....