ML, I have several ponds with no vegetation; none. Don't know why but I'm not looking for a solution without a problem. Putting GC in would be like stocking cows on a tennis court. We will soon be seining my forage pond for BG to stock a neighbors new pond. It's about 3 to 6 months old with no vegetation. The GC would starve waiting for vegetation to grow. I think amur can be added to control a problem but can't see how they could be used to prevent it.

Admittedly, I know very little about amur. Maybe they eat other things and wait for vegetation.

BTW, come on up to the hot, dry country. You can see a lot of places where grass fails to grow. It is real easy to overgraze here and it takes years for the grasses to get reestablished. That prompted my reference to cows. In a good year we can run about one cow on 25 to 30 acres. And that's on a good year where thoughtful range management practices have been followed. I no longer lease my land for grazing. I found out the hard way that I'm the only person who cares what happens to my land. The land I bought last year had been used and overused for the last 5 years. Winter wheat had been heavily fertilized. Now, it won't grow anything but ragweed. I expect it will take me about 3 or 4 years of work to get it in shape. Sorry to go off on a tangent away from ponding but I see a lot of parallels in range and pond management.