Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
If 1, 2, or 3 water changes don't help, then get some Seachem Purigen to put into your filter. If that doesn't do the job after a few days, then I'd suggest you need to turn to buying, borrowing, begging, or stealing, a UV sterilizer.
None of these things will fix the root cause of your algea problem, but the Purigen or the UV will certainly clear it up for a while, if not for a long time.