i dont think the dark plant substrate would work well, imo it would contrast too much. the tank looks modern and clean. white sand would help keep that clean look.
maybe make a hill in the middle, pants a few blyxa in the center and use some rocks or DW around the blyxa. maybe try some variety of carpet plant like belem hairgrass if you dislike open sand look.
also organic soil base can still work with the hill idea without showing the dark color of layered substrate - just make the same hill with the soil in the middle and let the sand cover it entirely from all sides so that no black shows against the glass. might look purer that way.
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