Algae ID?

[Waterbender]

Can someone ID this , it’s been in my tank for a very long time. Low levels of pho’s and no3 are not helping get rid of it. It grows mostly in shaded areas and where flow is not so strong. It can be easily blown off with turkey blaster.
I am dosing no pox so I thought maybe it could as well be some sort of bacteria.

Water parameters:
- no3: 1-2 ppm
- pho’s: less than 0.04 ppm
- alk: 7.5
- calcium: 425
- mag: 1360

 

[Jekyl]

@vetteguy53081