After scouring the web, about the closest thing to it is Fauchea laciniata, but that is just a guess.
Its real pretty. blue even without the tank lights on. maybe I'll set up a little nano to grow it out.
LOL. that was the first search i did and there are tons of flattened algaes with
blue color. As you can see in the pics i already removed it and put it in a specimen container, as i think any macro will quickly smother corals if left unchecked. and, yes it completely smothered the zoa rock it grew off of. I put it into a separate nano with some other macros because it makes a neat little display IMO.