I am a bit dubious as to plastic as a bio media as compared to ceramic rings or other material, per this thread here: So, Some Results/questions From My Giant Trickle Filter That said, I have questions about using plastic as a bio media, particularly how its basically free from any public trashcan lol. So first, bio balls versus plastic pot scrubbies. Bio balls are like some plastic ball, hollow inside or with some sponge thingie inside. Plastic pot scrubbies are a LONG strand of plastic, wrapped over and over and over and over itself, again and again. It seems that plastic pot scrubbies provide MUCH more surface area for bacteria to live on, so, assuming the same amount of oxygen, ammonia, etc., are not plastic pot scrubbies much, much better area versus area? It just seems a no brainer to me. Second, are there "bad" plastics, as opposed to "good" plastics? I ask this because I sometimes see people say, as a DIY plastic alternative, use water bottle caps. But, why not just use the entire water bottle? Third, isn't the best option as far as plastics and bacteria go is to use the smallest, and thinnest, plastic shavings or strings or whatever? Assume you have the smallest plastic area that a beneficial bacteria can live on. It can live on all sides of that. Now, combine two of those. That automatically creates an area, where they are joined, where bacteria cannot live. It seems to me that whatever is good plastic you want to shred it, slice it, carve it, etc. into the smallest pieces you can, obviously dealing with the issue that you have to be able to pick it up, wash it off, put in the aquarium, etc. I would sure appreciate any thoughts! Thanks!