I thought it was Sago, and Bill said it was narrow leaf pondweed. Mine is covered with algae as well, but I want the algae to disappear. I spot treated a couple of FA areas with the Phycomycin and it worked. 3 days and gone.

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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).