Help me ID this nuisance algae!

[Fisker]

I don't think this is dinos, as I done a dinos "test" and it came back negative. I know the test isn't a sure thing, but still, I think it holds some water. I don't know what else it could be, though! It grows in filaments, and has been growing and dying back FAST. Like, several times in a day fast. It's nearly impossible to touch. These are the best pics I can get!



I could be convinced that it is Dinos, as it looks a LOT like it on my macro, but it doesn't look like this anywhere else in the tank.



Here it is growing on some of my macroalgae:

 

[Big G]

Bump

 

[Fisker]

Some people over on N-R think it's a type of filamented Cyano - which might make sense. It failed the dinos test, it didn't disappear last night, and bubbles are only appearing where it's growing on macros - which would make sense, as the macros respirate and the air gets trapped, bubbles form.

 

[Subsea]

It looked like you started two tanks during the last half of June. Difficult to tell with blurred picture.

Is that Grape .caulerpa getting covered up?