Is there a point in using bio media in my HOB Filter?

[Aqua Hero]

Im asking this question as I know bacteria will be on pretty much all surfaces inside the tank (plants, hardscape, substrate) and in the filter on the media (sponges and rocks).

But do I really need to have bio media (eg lava rock/seachem matrix etc) in my filter and instead just run sponges and filter floss in it. So that I can have maximum flow for the filter.

I'm currently using an Aquaclear 20 with course sponge as a pre filter and medium course sponge, filter floss and seachem matrix in the filter.


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[hypnogogia]

You don’t need special bio media. Your filter sponges will host the bacteria needed for biological filtration. Take a look at:

7. Aquarium Filter Media

The media in an aquarium filter is the most important variable when setting up a filter.

aquariumscience.org

And

Is expensive bio media worth it?

Obviously we all want the best conditions for our fish/inverts, and expensive bio media may have more surface area - but at what point does it stop being worth it (i.e. cheaper media would convert everything to nitrates anyway)? Do you guys think the expensive stuff like Seachem Matrix and Eheim...

www.ukaps.org