Borrow, rent or buy a UV and that will be the ned of it inside 2-3 days and it'll never come back again for the most the part.

Mainly a new tank issue.

Diatom filtration, micron filtration etc also works well.
Folks with high light, pc lighting etc gert it when they do not add enough plants, or mess up the CO2 etc.

No matter what anyone says, you are not going to limit this algae, so you can forget not adding nutrients, it will not make this algae go away.
Folks have tried for months without dosing, no effect.
Blackouts also.

Not enough plants, too much light and poor bacterial colony = GW everytime almost.

It's one of my model algae I like to work with(easy to get rid of, does not real harm to plants, and easy to induce and homogenous(even throughout the volume of the infested tank).

See if you can borrow a UV etc.


Regards,
Tom Barr