Any idea? Person I got it from no idea what

Acropora sp. maybe with some more growth someone may get it down to species level...maybe a bottlebrush type or tri-color...

That's an aquacultured species that frequently comes in with colonies on mounted plugs, looks a lot like the "incredible hulk" acro, my guess is a horrida.

How is your water parameters? The frag appears to show RTN symptoms.

good as far as my other sps and corals are concerned. I got it yesterday. I took the pic about 1/2 hour after I got it glued in. Here it is today.

still looks like its RTNing.
was it like that when you got it?

looks pretty cool. is that orange i see the the polyps maybe or green?

It looks like your alkalinity is low the way that it's peeling at the base, I'd get on that asap before you lose the thing...

It is not peeling. I got it yesterday.

Here is a better pic with polyps closed

haha, that looks like a completeley different coral of the same type, is there any chance that it cam from the bottom of a big colony

Oh, that one's usually referred to as a candlelight acro, turns very nice under higher lighting!

eh,i have a candlelight and it doesnt look like that at all, it looks a lot more like my bottlebrush

candlelight polyps are much pointier on the ends while bottlebrushes have the more rounded polyp tips

I had a candlelight and they looked identical...

don't really know what part it came from. never saw the mother colony.
Here is a pic with flash and some polyps extended if it helps any. I looked at both bottlebrush and candlelight pictures and can't really tell apart though the images I looked at could themselves be misnamed.