Gotcha. So an algaecide like Cutrine (for the algae) and an herbicide for the duckweed (etc?). Any suggestions for smart ways to lower the nutrient load? Previous owner definitely was not on top of keeping the pond bottom clean of leaffall, etc. I haven't ventured into the pond on foot as of yet, but my guess is that there's a lot of muck.

The previous groundskeeper came today to help me install the fountain. He told me he used something to kill the algae once, and the neighbor downstream was angry because he claimed it killed all his trees. Seems a little unlikely to me.

…ryan

"The old pond. A frog jumps in: Plop!"
– Matsuo Bashō