Can someone ID this please

[installman]

I have this mystery coral that is growing on the starboard bottom of my tank. I noticed it a few months ago and it was tiny, like 1/2" across. I have a pic of it from about 1.5 months ago when it was about 1" or so across and another I took of it last night, now it is about 1.5" across.

 

[sc50964]

Wow that's pretty neat. Never seen something like that just growing on sand.

 

[Frick]

Maybe an Acropora. You are not going to be able to get a closer guess than that for a while. That has some growing to do.