If you actually use an aquaclear filter, the filter media sized for that unit (i.e. if you get a AC200 and buy the AC200 media) it is sized to use multiple types in the filter basket (I think you could stack 2 AC200 foam "cubes" on top of each other, etc.). I usually just buy the next size up foam and use that.
Here's an interesting short article about the "sharks" used in freshwater. It makes some good points about the different kinds, but doesn't go into much detail.
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