Aquarium Biological Media Replacement

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Rub the PVC pipe with Sandpaper

Get a PVC pipe with a small diameter; less than 5 cm is ideal.
Rub the outer surface of the PVC pipe with 120 grit sandpaper to create a rough surface.
You will want the surface to go from feeling smooth, to feeling grainy. The goal is to create as much surface area as possible for good bacteria to colonize.

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