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Thanks everyone for your comments.
I think Mill's repro highlights where the apparent green cast is coming from. You can see that the stars have a green halo. The backround is balanced. If I try to adjust the colour balance it is reflected in the background and it starts to look completely off. I am guessing that the focus slipped a bit between the red and green frames before I refocussed prior to the blue frames.
The blotchy backgroud was a lot worse than what it is. The noise came from the blue frames. I got rid of most of it but there is a balance between blotchy and looking too smooth.
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