Is this B. Pennata?

[JAS927]

Is this B. Pennata or some other algae species?
It has a blue vein down the centre of each stalk and a feather-like plume of green. It’s growing in thick short mats that came out of nowhere very quickly!

 

[Gumbies R Us]

Is this B. Pennata or some other algae species?
It has a blue vein down the centre of each stalk and a feather-like plume of green. It’s growing in thick short mats that came out of nowhere very quickly!

Do you have a photo under white light?