Well i have tried to pick it out with a hose and suck it up and it has work but there is so much of it. Also most of it is attached to my moss and I lose a quite a lot of moss when i tried to suck it up.
I would just wait it out then. It will disintegrate in time. Fighting algae and dealing with the conditions that cause it takes alot of time. Unfortunately, this hobby takes alot of patience.