Then there's no reason why you have to stock the Amur.

What are the goals for the pond? If you plan to do any swimming in the pond, then for sure I'd include RES in the mix.

What else is in the pond now besides the HBG, and what size are the fish?

What size are the fish that you are planning on stocking, and what numbers of each?

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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).