sand question

[AJ_77]

I think you would be OK to mix the larger grains in. that stuff looks great. The best sandbeds I've had have been mixed grain sizes, sometimes all the way up to gravel.

Eventually it will mix to a point on its own as it is disturbed by the in-bed fauna. The tiny sand will settle down through the larger grains, and some of the larger pieces will be displaced upwards.