Coral ID?

Any idea what this is? We noticed it before we left for a 2 week vacation. It was pretty small at the time, noticed only a couple buds. When we came home it had grown huge!! Not sure if this is a good thing to have?

 

Caulerpa racemosa I believe, very invasive. Remove what you have as thoroughly as you can.

 

Thank you, will do!

 

I agree with coralline it looks like caulerpa. Its invasive. Its great in your sump if you have a refugium but not in your display tank

 

agreed aka Macro-Algae

 

Is that something an emerald crab would eat?

 

Definitely get rid of it. It covered everything in my last tank. I ended up taking the whole tank down after that.