layer 1 1-2 cm deep
some sort of undergravel fert-daltons aquabasis laterite etc
layer 2 2-4 cm deep
sand good ol play sand
layer 3
gravel 2-3 mm in size any colour you choose
under gravel heating if you choose
closest thingto that foreground look microfolia, latefolia, subdulata? pygmy chain sword (couple of types) novo zealandia that sort of thing
HTH