Yeah, watermeal is tough. Neither the tilapia nor the aerator made any real difference. I have Sonar coming via FedEx Ground. I've noticed that below my plant-rock filter, the vegetation is extremely lush, which makes sense. I was wondering if there is some kind of plant I could cultivate that requires copious amounts of nutrients. If I could find a way to suck up as many nutrients as possible before it goes down the hill to the pond, it might make things easier.

This year, we're going for a four prong approach: Tilapia, Reward & Sonar, Bacteria to speed decomposition of leaves/crap on the bottom, and the aerator to keep water moving.

We really just kind of wanted a pond to sometimes kill time in the evenings and it's turned into more work than we anticipated and has also been quite expensive.

Thanks for the replies.
Jerry B