Thanks everyone. Mike, I did have some trouble with chromatic aberration around the bright stars, and tried to fix it but obviously not very well. Something to work on I guess.
Thanks everyone for your comments. Greg, the green is something I had trouble with, it was a lot worse, but wanted to retain some hint of it in the core as it's primarily OIII emission there. I'm using Startools and don't have Photoshop, so can't use that plug in.