My club uses Carbon as needed. For clearing meds etc...
We stuff extra filter wool or media into our filters if it fits to provide more surface for BB.
Anytime filter slows we just rinse pads or floss in the bucket of used tank water or in dechlorinated tap water so the BB does not die off.
So yes pads provide surface for BB. Some filters you can stuff with filter floss or media, some you can only use a pad.
My Aqueon 20 pad is probably at least six months old. I just rinse it as needed. There is old carbon in the pad, I ignore it. The pad is there to provide surface for my BB. My tank is also heavily planted, but I still want a good amount of BB in my filter.
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