wonder why your pics do not upload because they have made it a lot easier to upload .I can understand that Canadian air and can they please keep it up there LOL .You are lucky then that the pond heater is doing it's job well and it is really worth the expense then .Aerators will not keep a big hole open unless the airline is close to the top of the water or you have a large aereator ,Last year I tried that and ice formed around the air hose and pinched it closed and burned out the aerator .I guess I should not have clamped the air hose to the aerator but thats what it said to do so I did ,big mistake that was .I bought a new aerator this past spring and sure not trying that again .It looks like you have some expensive equipment so don't blame you for not taking any chances .My pumps are all cheapy harbor freight pumps 22 dollars to 30 dollars each .I have had some of them for over 8 years so for me they work .940 gph and 1268 gph and last year the 940 gph burned out and I had the 5 dollar warranty so they replaced it no questions asked .I actually gave my neighbor one of mine that is 6 years old and they love it .There's burned out and it was a tetra one I think