M31 Andromeda with rarely imaged Oxygen Nebula

This image was the most challenging I have taken, both in the sheer number of hours required to image the oxygen(bluish nebula above the galaxy) and in the time needed to process it.
I made several runs at processing and discovered that my processing skills have a long way to go. lol
The bluish nebula is from Oxygen, and the red clouds are from hydrogen. 
The oxygen nebula was only discovered a few years ago, yet it is one of the most photographed objects out there. I used a 3-nanometer oxygen III filter and captured 690 ten-minute frames for 115 hours of oxygen data. I also used a 3nm Hydrogen filter and captured 38 hours to get enough signal for it to show up. I used hydrogen, oxygen, sulphur, red, blue and green filters for 171 hours to make this image. Ultimately, I didn't include 7 hours of sulphur because there was little signal to work with. 
The telescope was a William Optics 68mm with a ZWO 2600 monochrome camera. The 3 nm filters record a narrow spectrum slice, which significantly helps in light-polluted skies. For example, red covers 600-700 nanometers in the light spectrum. The hydrogen emission line is 656nm, so the filter should record 654.5 to 657.5 and effectively block all light outside that spectrum.
I spent months dragging a tripod and lens in and out of the house. lol