, I would just skip putting a filter on the tank all together. Your bioload is not very high and you have plants. A simple power head pointed to the surface to help O2
exchange and move the water around the tank is all that is needed.
This helps keep the amount of equipment in the tank to a minimum.
There are many beautiful nano type tanks that don't have any additional filtration (besides plants).
The Azoo palm filter or the Rapid mini cannister are also another option if you want a type of powered filtration.