When you mean "stuff", what are you talking about? I see at least 3-4 different plants (and FA) in each picture. If you are talking about the "stuff" that's floating on the water, that is algae.

If you can, get a small sample, put it on a white background, and take a clear close-up picture.

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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).