I would look at a 10ppi coarse sponge followed by a layer of 20ppi medium density.
This blend offers a great mix of water clarity/maintenance schedule.
For your biological media (siporax, ceramic noodles, Matrix etc) to remain effective it needs to be kept clean of biological buildup. This ensures the microscopic surface area of the media comes into contact with everything it needs to remain biologically effective.
There are a multitude of biological media that thrive with a build up of biological matter. These however are not suited to canister filters.
Good luck