Okay - The weird snail thing (which I now know as a Money Cowrie snail, thanks
) is back in the tank - I was VERY confused and in awe by its mantle, and how it would envelop the outer shell. I remember having the shells as a kid, and always thought the "teeth" were super cool. It's nice to have one, and I'm VERY happy they're not evil
The concern I had with the polyps was the similarity to the Colonial Hydroids from the xtal reef site, and the fact that they didn't play nicely with my colt (which all the other polyps I have in my tank do just fine) concerned me...
Good to know
Thanks all for the super quick responses!!