The dye will do no good for those plants. It works by reducing sunlight to the plants, and as you know, they float.

With no predators, you will have to fill that role. Perch will stunt because of overpopulation, so you and a fishing rod will have to keep them in check.

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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).