I just manually remove it aggressively. Do not fret, the critters and desirable species will fill back in.
If you keep up on it, it never gets out of hand.
Water changes are your friend, you cannot over do those.
I'd stay away from any snake oil that claims to export or control NO3.
There's only one way to do so short of a water change, macro algae export etc: denitrification.
Coils or the DBS are decent methods there, with DBS being the easiest.
During the water change, you can do all sorts of cleaning etc easily.
Harass it. 1 sq ft is nuthing to clean, I've cleaned 8 ft planted tanks covered with BBA on every surface.
Do not wait for a weed to go away, attack it asap.
That and good general care will go a very long way.
PO4 limitation can work well in most cases.
If you keep a refugium, the NO3 and PO4 would be gone and provide a great place for a DBS.
If you focus on the needs for the other critters and plants in the tank, the noxious species rarely bug you.
That's always been a good approach and method in the hobby in general.
And that is the goal, not learning how to kill various noxious algae
, name some folks that wanted to do that as a hobby?
Some weeding is required, some cleaning etc, and if you neglect things for awhile, algae outbreaks can and will occur.
But if you stay on top of it, the effort is much less.
Regards,
Tom Barr