24g Nano Cube questions...

Hello all, I'm new here but have had a couple nano reefs over the years.

I just bought a 24g JBJ Nano Cube. My question is, if I use a protein skimmer, do I eliminate all other filtration, (sponges, carbon)? or do I use it in conjunction with other filtration?

Also, what skimmer fits the 24g nano in stock form (hood, LED lightning). Please
provide pictures if possible, on how you're skimmer is mounted.

Thanks, Mike