Kenny,
there are many filter media that, although not aquarium specific, can be used with good success.
Everything that is atoxic, that offers a good surface to volume ratio and that allows a good water flow is suitable.
There are many media that have, more or less, the same efficiency than bioballs (like Dupla Biokaskade or others).
For a tiny bit of their cost of course.
Feel free to experiment by yourself.
Kind regards.








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