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Tinyfellows
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The Co-Op has a good video about optimizing HOBs with coarse sponge (I'm assuming you're asking about HOBs, but this really goes for any filter). It really comes down to personal preference. I've used those plastic scrubbies you can buy at Walmart with success. Some people have used crushed lava rock. Just anything that's porous with lots of surface area will be ok.

 

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