Rooted plants will help BUT 1) They need to get sunlight so they can at least partially stay alive. They usually won't grow because of the cold water. 2) They need to be the type that doesn't die back during the winter.

If there is a lot of plants in there that die off, it can actually hurt the pond because the dead plants will start to decay and the microbes and bacteria will need O2 to keep that decay process going, O2 that the fish need.

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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).