What is this stuff?

[jmann124]

I'm not sure where this belongs but I'm putting it here. Move it if you must.

Anyone have an idea of what this clear fingerish looking stuff is?

http://img.tapatalk.com/d/13/03/15/jy7utaru.jpg

[seapug]

looks like the start of Dictyota algae. Can be pretty but also spread like crazy.