Welcome Jack. Lots of us would like the idea of self sustaining but it seldom happens. Lusk sez a pond is like a garden. It has to be managed, culled, etc.

You might consider channel cats. They try to spawn but are seldom successful. Also some hybrid bluegills to take out some of the mosquito fish. Bass seldom work out in less than acre.

I would hesitate to go further until I clobbered the duckweed.

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