For algae, if you are not already overwhelmed, spot dosing liquid carbon products will kill it (use a seringe to dose 1-2 cm above the algae). This is hardly a long term solution - it will only kill the algae clumps you dose, and it will likely pop up somewhere else. This is usefull if you want to quickly get rid of unsightly clumps.
As for long term, not sure how to permanently rid yourself of it. I merely kept mine under control with regular cleaning, liquid carbon dosing and removing plant leaves that were overwhelmed.
! Do not dose more "carbon" than your plants need!