My aquarium is infested; it's on the plant leaves/pebbles/glass.
I tried to remove everything manually but it soon bloomed again, big water changes, shortening the lighting time, but no success.
It used to have some guppies; now, only snails (Melanoides/Physidae) and a single Ancistrus in 60 liters.
And for plants, only a few Cryptocoryne wendtii.