My lesson was don't ever put a pond near a lot of trees at an the bottom
of the garden. In winter you just cannot keep on top of it even with
netting........it is just too dark when you get home from work or before
leaving.....your only option is weekends when 5 days worth of crud has
already killed your water quality......and fish :-(

Gill (with new pond not close to any trees and right outside the house)