Al these nanos are the same size: 27 liters (30x30x30 cm) Kind of low tech, just small internal filter, 11 Watt PL-S (color 840). I do use reverse osmosis water. FRK (Is like Lateriet) & sand substrate, profito weekly. Thats all.
In every tank I try to maintain these parameters:
Fe - if it's there it's enough