lots of people do not like to use API algae fix, it will help though. anything sensitive in there may want to put into a different tank while treating it..super stressful for fish. dose 1/4 than recommended / break it up into several water changes.
also rinsing plants if they're not fully planted easy way to remove algae b/c it'll grow back.. decrease lighting schedule + small internal filter helped out tons for me.
actually i've used the algeafix before, it helped me with an algae bloom, but it doesn't help with algae on the sides/bottom of the tank