Is it mobile or stationary? What is it's size? Have you seen it try and eat...do you see a mouth? It is freaky - not sure what it is, but if I can get these questions answered I may be able to track something down.
Sorry for the short responses I have been pretty busy lately.
Anyway, the little guy is about 1/2" - 3/4" across. It seems to extend and contract like an aptasia only faster. As for movement, it seems to be stationary. Any other guesses? I have checked numerous sites but nothng like this....