You can check out examples of filter media that are popular in this thread: http://www.aquaticquotient.com/forum...o-Filter-Media
Everyone has their favorite filter media of choice and quite frankly, its tough to quantify which one is best as each brand has their benefits and all market theirs as the best too... i guess you could read through the various marketing literature to help make your choice.
Personally, i've been using Seachem Matrix for all my Eheim filters (including in my Eden 501 units too), so far they have been working nicely and hold beneficial bacteria well enough during transfers to further seed and cycle multiple tanks quickly.
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