Thanks for the responses. I will spend some more time researching grass carp, as well as look into the tilapia suggestion. Right now my water temp is just above 50 at about 4', so I assume I would be doing the tilapia thing seasonally also. I don't even know if tilapia are readily available around here. How many do you put in?

Anyway, right now the pond no longer looks like a cesspool, so I don't have to listen to the wife wanting to know why I didn't just put in a lap pool with a pretty fountain.

Thanks again, Tom