Caribbean creature?

In the 2nd pic he got much smaller, then his disk shape was gone and that was the final result with lights off.

 

Still looks like a type of either warty or cork screw to me.

 

I was more excited when I thought it was some kind of Rocordia, being some little anenome just does not seem as appealing, but in a search of the list of anenomes none seem to match, the rock anonome looked to closest in matching, but thats something an anonome that doubles in to Ricordia.

 

that may be atype of open brain coral just vary young or a type of nem.

 

It's pretty cool alright, when its in the disk like shape the coloring is almost like a frosty white, small, but neat.

 

flower or beaded anemone. They are the same just depends on who you ask.

http://www.whatsthatfish.com/fish/beaded-anemone/823#5

 

Will that sure looks like my guy, the pic in your link is much prettier than the one I got, so it's safe to assume mine will get bigger.

I do know he has a powerful sting, a turbo snail bumped
in to it, got stung and didn't come back out of his shell or move for almost 2 hours, hahaha.

 

They grow well. They do not like any other anemone's in a tank. They are one of my favorite nems. Only a couple species of clowns will host them. You can touch them the stings will feel sticky but its always better to wear gloves in a tank. Snails and hermits will actually gather next to them for unknown reasons. I wouldn't worry about your fish, health aquarium fish rarely if ever get eaten my any nems.