After many attempts, I finally saw a dugong in the Red Sea:
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The rest of the video is just the usual Red Sea stuff, mostly in the 10-20m range so ambient light/manual white balance/red filter.
For GH5 owners: the lizard fish (2'32") is what happens when you insert a 6K photo/video file (i.e. 18 megapixels at 30 fps) into a 50 fps video. The porcupine fish (2'13") was in a place that looked very dark, 15m down under an overhang. However I dropped the frame rate to 25 fps, and shutter to 25 too, with ISO at 1600. Quite good low light capability, at least for something that isn't moving fast.
All constructive comments and criticisms welcome!
Cheers,
Matt