It looks good Mark. As long as adding the Ha to the red doesn't destroy the colour balance too much (sometimes just need to play around with percentages) then you are doing fine. As Mike also suggests, adding some Ha to the blue will simulate the Hydrogen Beta signal. Off the top of my head, it is suggested around the 10-15% mark, this then gives the lagoon a bit of a purple hue which is quite accurate I believe.
There is nothing wrong with just going red though as it is quite clearly a very Ha dominated area.
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