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Ha LRGB blends are tricky. Your Ha colour seems fine but the background seems to lack other colours. I think I see a touch of green in the background. I get this a lot. It comes from airglow which is often green and shows up in digital camera images. I didn't know how common it was until I started doing a lot of nightscapes and I see it all the time. Sometimes its ridiculously strong.
Excess green is easily gotten rid of though with SCNR in Pixinsight or its Photoshop brother HLVG free plug in.
Then push the blues a tad more. How did you blend the Ha? I don't think anything beats lighten mode.
Greg.
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