I've never heard of the needle wheel, are you referring to the magnetic spinner in a lot of filters? If that is what you are talking about i prefer that as well, i use a HAGEN elite Mini to diffuse my co2, its in the tank which kind of sucks but its a 20gallon and its on my desk so i cant have tons of PVC below it, it would be unattractive. The mist it creates is much finer than any ceramic disc i have ever seen.
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