It sounds like the fish farm was not managing their ponds. This happened to me about 6 or 7 years ago. NO PROBLEM. They are all gone.

I'm one that doesn't see a problem with the much maligned green sunfish. In the presence of bluegills they always get out spawned. With their once per year spawn, they just don't do a very good job of competing. The bluegill will take over.

Stocking fingerling ANYTHING is going to guarantee heavy predation with an existing fish population. Get some 6 inch bass from a reputable supplier. Emphasis on reputable. It wouldn't hurt to also stock some 4 inch bluegills. Over time, two or three years, you should see a shortage on greenies and a heckuva lot of bass growth. Due to their more elongated shape, they are a preferred food source for predators of all kinds.

In other words, I wouldn't sweat it.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa