California Nebula NGC1499 in Perseus in RGBHa

Looking at the halos from Duoband, I "freaked out" and processed two sessions of 32x120sec of California, taken with the UV/IR Cut and HaOIII filters using Sirilic in "multi-session" mode, and then applied the Pixelmath tool in Siril and made a combined image from RGB and Ha. As a result, no halos (it turns out there are none in the Ha layer). And the stars are now colored. Beautiful!
Obviously, this is exactly how these nebulae should be photographed - over two nights (or one, but with two filters).

The California Nebula NGC1499 in Perseus, a combination of stacks with UV/IR Cut and SV220 Duoband filters.
Equipment: SW66ED+WO0.8III, Celestron Advanced GT mount, Angeleyes 30F4+Datyson T7M guide, Svbony SV605CC camera, Svbony SV220 duoband filter.
Exposure: 32x2min, gain=130, offset=50, t=0,
Processing: Siril
Taken on the night of September 26-27 in Pushchino, Chuvashia (MPC:M12)