So I got my 10g on a whisper 20 HOB filter, I am wondering what I should used for media for it. I know they have the pouches you can buy, but are those necessary? It also has the little sponge like thing in there. Would it be okay if I didnt use the pouches, I am pretty sure they have carbon in them...I dont have the box right in front of me. Can I just buy another sponge thing for it or how should I set it up? Bio bag, thats what they are called, do I need those or is there something better? Are they necessary? The other piece is called Bio-Foam.