My 40l tank 350Lx400Wx350H it has a filter bult into the back that holds the media and heater and gets pumped back into the tank, lighting is 24w in pl tubes.
I have a under gravel heater and i dose with sera flora day drops evey day also using tab and liquid fert, every week when i do a water change.
it has been set up for about 3-4 months.
Plants are a verity of crypts, some tiger lotas, red mac, rotalia, ambulia, anabus nana.plus more.