It is cold jw, the new pond has 5 inch thick ice, the lotus tub around 4 inches, the big pond 2-3 inches.
The deck ponds look like they are frozen solid. Which I expected since there is no insulation, they are on a deck and shallow.
Love the patterns ice makes
Even looks like clouds
See the black diffuser that I what I am using, it makes a volcano of bubbles.
The air line is 3/4 inch. I would make a nice pot, rocks something permanent, but it is only in the pond over the winter. I have not been running an aerator in the summer. Did manage to brave the ice water got a big rock tied to the tube and sank it again.