PF

9 x neon tetras
1 x dipped pencilfish
2 x pearl gourmais
2 x red robin gourmais
1 x german ram
3 x peppered corydoras
5 x guppies

i have been keeping this stock of fish for over 5 months now with 4 bunches of plants and a small shelter in my 35 litre tank 50x25x30cm. they have remained very healthy and i've had no problems with the water quality. But upon reading about stocking this would come under overstocked. is this the case?
thank you very much