This is why human elbow grease work must be part of algae control/invader control
Get a habit early on of cleaning and exporting invaders first, by hand not by fish as mentioned, then use the cheats to keep them at bay.
You would hand clean every surface of the tank using extra water changes first and then use a uv to kill suspended leftovers before they can resettle. And when some do, you hand remove that as well. Uv works great over time, and nothing beats your hand and making any tank reef or marine algae free. Not hand beating invaders is the no 1 reason problem algae threads exist. Letting things go untouched at the beginning of a tank is half the problem
Sure,sometimes they go away....but what if they don't? You can get multiple communities of algae and diatoms growing in slime mats etc and mostly keepers refuse to act directly on them, they'll always choose secondary routes and hope for the best.
It has been fun and terribly easy guiding my new micro planted tank to invader free growth over this last month
When the brown came, I cleaned it all off over and over for a week with giant water changes, it was never allowed to exist. Still isn't.
When the green came I clipped off the old leaves it was colonizing, and used peroxide paper towels to wipe off some of the rocks and leaves while the tank was drained for the giant water changes, which begins to actually direct kill algal cells along with giant water changes to export nutrients and invader cells cast into suspension
Contrast this to the common method of set up tank, use partial or no water changes and cross fingers hope it goes away. Deliberation at the start, not in the middle saves a tank before problems begin.
Thank goodness my tank is half a gallon I feel sorry for large tank owners
I'd be getting a uv grossly oversized, not just sized for the tank.