Identify this macroalgea?!?

[rcnewbie]

Can anyone help identify this that has started growing in my tank over the past couple of months? Is it okay to keep letting it grow? How big will it get?

Thanks for your help.

 

[billsreef]

The green stuff on the top left? Will need a sharper picture to be sure, but it looks like a Caulerpa species. If so, it can be an invasive nuisance in a reef tank. Fine in refugium or plant tank, but can overgrow corals in a reef.

 

[rcnewbie]

Thanks Bill - I was referring more to the rust and neon blue colored "leaves" in the center. I've looked through my encylopedias but so far haven't found what I have in my tank.

 

[billsreef]

Can you get a sharper picture? I'm not seeing enough defination to distinguish form of that algae in the center.