Here's a pump,just search for these on amazon.
https://www.amazon.com/HEALiNK-Permanent-Compressor-I have a solar setup running now. I have one 100 watt panel, charge controller, motor speed controller, and two 12V gel cells, and a timer. It currently runs 14 hours a day and uses half the battery charge.
Thanks Woodster. Sounds like it's working for you. Hope this helps CajunFisher as well.
I checked Amazon. They have a HEALiNK 12v DC pump, rated at 140 L/M, rated pressure at .10 pa (not sure what that means.) For $105.
Hopefully that would be enough pump for 15' of water and two diffusers. Looking at pond aeration websites, a solar aeration set up is $7,000. I must be missing something. I know I've got to add panels, batteries, some type of power management, and timer, plus enclose it all.