TAPEWORM,
How do you know bio-media is working good?
I went through a phase where I was trying many of the "high-tech" bio medias. Problem was I couldn't tell if one worked better than the other; or if it was working at all. The parameters never changed going from one bio-media to the other; ammonia & nitrites zero, nitrate production the same.
I have a medium stocked 26G tank right now that has been running without a filter for four weeks. The BB in the substrate and water circulation from a bubble wand and power head is keeping the ammonia & nitrites at zero; the same as when I had the Magnum 350 on it.
Are we being manipulated by the manufacturers into thinking we need high-tech mega-bio media?