In my future tank setup, I've got this media setup, in descending levels:

FLUVAL PreFilter Media
Coarse Filter Plastic Bio Media (See Image)
Carbon Bag
FLUVAL BioMax Media

Assuming that the water flow goes from the top and out the bottom hole, this setup is valid, correct?

And also, are plastic sponges like this good for media?:

It's okay if they're not, I'm just asking.