Just curious as to how long has the tank been set up ?
Only asking because on the pics the damp and dry sand lines are very even and i would have thought that the shallow area of sand would be dried out
:wink: :wink:
I tried something like that but the sand was drying out very quick and when i added water through a pipe the bottom layer got flooded (well nearly

) but the middle and top layers stayed almost the same :evil: