You would need a good substrate for a low-tech tank. 1 inch of potting soil top with 1-2 inch of gravel will be good. The substrate will supply the CO2 and nutrients needed by the plants.
1.5 to 2.5 wpg of lights will work of a low tech tank.
Most plants that grow in a high-tech tank will probably grow in a low-tech one. I have got glosso to grow to a quite nice lawn with abt 2wpg, it takes a bit patience to coax the glosso to grow horizontally. APP grew quite nicely for me in my low tech tank. Hairgrass will also do well in a low-tech tank. Plant as heavily as possible as you would in a high tech tank.
Fertilisation is only done when neccessary. Sometimes when you have good fish load and substrate, it might not be neccessary. I use Seachem Equilibrium initially. This will supply Mg, Ca, K, Fe and Mn. I dose KNO3 and traces (Easylife Profitto) once in a while when my plants exibit deficiency. This occurs quite infrequently. Feed your fish well. The waste from the fish and some leftover will supply the CO2 and nutrients with they get broken down (the bacteria in the soil substrate will do this).
Moderate filteration will suffice.
As in the high-tech tank, you will also want to keep surface turbulance down to minimise CO2 loss. Air pumps are not recommended too.
The inhabitants you suggested looks fine.
BC
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