I decided to pull up the water settings for some biomes in the editor, and compared to the default, it looks like the values for lerp/sky reflections/sun strength are generally higher, and the surface colors are generally blackened. I might make a pr that makes some adjustments...
Default:
5dcc46b0-3201-4b81-8eec-0b06e6f2055c-image.png
Mars:
33029a63-2a66-4067-86e1-c757bcf9ceb5-image.png
Syrtis:
a54b7b88-0ade-412a-be95-b804bc4638a4-image.png
Stones:
faf7f39f-fae9-401d-a5d3-a62fb89ea406-image.png