This is how to make cheap bio filter. material that i buy from that video is just Bio Foam & crushed coral it’s very cheap maybe just 3 dollars and i just use quarter of them. so you can make two more Bio Filter using that material left. it’s very cheap. also that filter can be used in bare bottom tank or graveled tank.
You need to be creative and use anything unused material around your house.
for another video about how to make bio filter you can watch here :
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