Not trying to cut anybody down, and I am doing my best to avoid the whole argument of pro/con bio-wheels.... I am actually neither. I could honestly care less! I avoid all of the debates regarding hardware because when it comes right down to it, whatever works for your tanks is fine with me. I was trying to respond to lithril's question about what a bio-wheel filter was and I gave a response that best suited what I pictured in my mind.
In my experience, with my tanks, and only my tanks, they have done better without the use of a biowheel in my AquaClear brand power filter. Whether I can prove to you or not my choice is the right one? I have no desire to, nor could I. My water chemical levels were the same with or without one. Why? Because I take care of my tanks. Why did I choose to take it out? I thought I'd give it a try. Why did it stay out? Because my water looked cleaner and my fish seemed more vigorous. In the end? The bio-wheel stayed out.
Maybe we're not on the same page with our lingo? When I use the term bio-wheel I refer to the little things you stick in your filter, but the impression I get after reading the latest is you are speaking of external canister filters? I have not used the canister filters. I would love too. I'd also like overflow tanks, uv sterilizers, etc.... I haven't had the spare money for equipment upgrades. Although I am going to set up one of my extra tanks to try one out.
Here's a horrid little fact maybe you can rip apart. I like to use carbon sometimes too.
Devin