Dwight, the lack of FA might be due to the large amount of water exchange going on in your pond. I see the same thing when my water mimics yours. Right now mine is stagnent (i.e. not moving much) so I'm seeing more FA along the edges.

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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).