thinking about sand mixed with gravel

[guppy breeder]

or like sand fading into gravel

 

[Bderick67]

I used to have a mix of 20% natural gravel with 80% sand. It made it so the look of the substrat was always changing. I would do a gravel vac and the look would be all sand, then over time the gravel would somehow rise to the top.

 

[guppy breeder]

nice