I would go with the liquid fluridone. The plants are on the surface, not at the pond bottom, where the pellets are targeting the plants. Yes, the fluridone gets in all the water column, but I would go with the liquid, such as Sonar A.S. It is available in as small of a container as 8 fl. oz.

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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).