7mag, welcome to the forum. To take out the rough fish without bothering the "good" fish, the methods are exactly what you are doing. It sounds like you are on a good road of recovery. What are your goals for the pond?

How much cover is in the pond?

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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).