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I would like to note two points:-
1. Recently for shifting reasons, I broke apart a two years old 25 gallon
tank with substrate of vermiculite+clay(3inches) topped  by 1 inch of coarse
sand, and I found that both the layers were practically homogenously mixed.
During the span of two years, the heavier sand must have gone down.

2. I had a piece of driftwood which was not sinking.
    After boiling it for 10 minutes, now it is properly sinking and

Dr ajit athale
Baroda, India.