Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
If it's a bacterial bloom, Purigen will not likely help much. Purigen picks up a lot of unwanted compounds & impurities, but will not deal with a bacterial bloom which just needs time to correct itself.
Your 1 packet of Purigen is sufficient for the size of your tank, and it will eventually produce good water clarity once the bacterial bloom dissipates.
A couple of large water changes should help correct the problem.
Be patient and have faith.