You guys are all very funny, ha ha ha!
More Water you are also taking this all very well, and I am sure I may have put some dead fish under this pine tree in past years, now pine tree is too big and needs to be chopped! Fish Fertilizer is pretty potent!
But seriously, I would think of running a winter pump and filter in front of the pond heater all winter, and do not forget to add fresh water when it is minus 30 below! It if is going to be really cold like minus 40 below, I add water to bottom pond just before I go to bed, just in case too much ice develops, to ensure there is still water for pump and filter in that bottom pond. Oh the things I do for my fish, like pry the frozen back window open and run and house out of the window to add water to pond system in the dead of winter!