These are also very well suitable for a so called Deep Sand Bed (DSB-System).
With Deep Sand Bed the sand is layered upto ca. 8cm-10cm high and thus acts as biological filter. Tanks without DSB-system manage with a 1-2cm high layer of sand. Sand with a high calcite percentage should be washed out several times under tap water before use. For inoculation of sandwe recommend bacteria for example Nyos Bac or Microbe Lift Special Blend, NiteOut and TheraP.