I have also just started adding cultured bacteria to my 1-7/8 acre pond last month to treat a 90% surface takeover of FA.
I treated the pond with 6 lbs and 12 days later returned to the pond and there was no FA anywhere in the pond.
Is the reduction in FA a side effect of the muck reduction? What I mean is that you are taking away what is feeding the FA.
Or, is what your adding have something that is directly going after the FA?