Quick and likely simple answer to my question.
I picked up a top fin aquascene 2 aquarium today (2 gal, going to be putting 1 betta in) as my first ever aquarium.
The tank came with a 'filter plate' that rests below gravel, with perforations on it's surface. These holes are far to big to serve any mechanical filtration purpose, so my question is - do i put a filter substrate underneath the filter plate? I made a quick schematic to explain easily.
NOTE - the tank is hexagonal (not pentagonal like shown), and the filter plate is not attached to anything, but just weighed down by gravel.
Thanks for helping a beginner out, and I look forward to gaining knowledge here!