Need help ID'ing this thing on my Live Rock?

[Fluid]

So I have a few pounds of FIJI live rock in my tank, and am going through the whole curing/cycling etc. I found some weird "leaves" I would call them on the rock, and was wondering if anyone had any clue as to what they were?

They are clear-ish round leaf looking things that are attached in multiple places around one of the rocks, I'd say maybe about 25 of them. They range in size from tiny to about the size of a dime.

Here is a few:

And then my whole tank:

Any ideas would be appreciated!

 

[robs.mark]

I have some on my live rock too, im a month into cycling and unfortunatly i cannot id what it is, just thought you may want to know your not alone! hopefully we can get some answers!!

 

[supervdl]

I think this might be an old Halimeda algae leave.

 

[MarkusII]

Hello,

no it ios not halimeda, that looks different; but for sure it is some sort of algae...

you can search here:
http://www.algaebase.org/

regards

Markus