That is FA. Typically a bloom is starting to establish 2-3 weeks after killing FA. If there is any FA growing, and you fertilize, it will just feed the FA.

Have you had the water tested for alkalinity, hardness and pH? If not, don't do anything until you do.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).