I have had persistent FA, and a very aggressive Great Blue Heron at my older pond, since it was renovated in August 2015. This year it has been muddy for some reason, maybe rainfall, and very little FA, and the mud frustrates the GBH.

Maybe it's the five Koi I raised in the forage pond last year, and transferred at about 10" last October. They are 12-14" now. I wonder if five Koi and seven or 8 CC could muddy up a 1/4 acre pond?

I have used dye in the past, and the first dye may have contained flocculant, because it not only dyed, but somewhat cleared that pond. I used dye in the older pond the spring of 2018, but still had bad FA last summer.

I prefer dye or muddy water to loads and loads of FA, personally.