what a treat to watch your slide show. It's as if it were right out of a magazine. So much work has gone into your pond and I can see how well you have mastered the art of eco balance for your pond. You did your homework and it shows.
Bio filters with screens has helped a lot but I also shut down the filter for a few days, less oxygen clears out the build up in the piping. A clog in the intake can be a nightmare ....time for bio dye.
You have great oxygenating plants so many varieties of plants around and in the pond and all the plants are so lush.
I luv the reality tour almost makes me feel warmer in my neck of the woods since winter has taken hold .