Hi and welcome to fishlore.
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what do you mean by "customize what media you want"
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Media has different functions in the filter.
Some media houses the good bacteria, some catch large and small debris and some "polish" the water as it returns to the tank.
Filters that you may be used to, probably have "cartridges" that you slide in and out of the filter when clogged or dirty.
Those cartridges are filter media.
Often they are discarded and a new one is used.
Most of the media in canisters and several types of HOBs (hang on the back aka: power filter) can
be rinsed in used tank water in a separate bucket and put back into use in the filter.
Here is a break down of a popular canister filter:
http://www.planetrena.com/Rena-Filters.html
The media is placed in the "baskets" of the canister. Different brands and sizes of canisters have a different number and shape of baskets.
Some brands of canisters come with media and some do not so you must purchase it separately.
Here are some types of media that can be used in canisters and some HOBs:
http://www.aquariumguys.com/filtermedia.html
There are other things folks use for media as well.
This is a poplular power filter (HOB):
http://www.petsolutions.com/AquaClea...510620+C1.aspx
The white sponge (often called foam) in the bottom of the AquaClear is media.
Typically in a HOB like this one the sponge is on bottom, a layer of filter floss is next and ceramic rings sit on top.
Carbon or charcoal is also media.
There are different opinions on when to use carbon in the setup.
Some folks routinely use it and some don't, unless there is a defined need.
hth,
alicem