Your gut is correct. A shallow pond will also be a PITA control the weeds and algae in. Wherever the sun can reach the bottom, they will grow.

A pond fills in over time, and being that shallow it won't be long before it needs to be re-done.

I'd treat with Rotenone to kill all the fish, drain and get 'er done correctly.

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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).