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Got some good depth there. Too much green in the image. Pleiades is quite bluish. Try ACNR to get rid of the excess green and it'll make the colour balance a lot easier.
Halos. Try shorter subs.
Halos like that are from reflections. Are you using a reducer?
What brand filters are you using? Perhaps they don't have adequate anti reflection coatings. Astrodon Gen 1 filters developed halos when the larer 16803 sensor came out. They brought out Gen 2 filters with superior antireflection coatings and those sorts of halos became a thing of the past or at least not very common.
Greg.
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