Can you tell me a little bit more about the Bio-Wheel Pro 60. I have a aquaclear mini filter for my 10 gallon which is supposed to provide biological and mechanical filtration, but want a biowheel. Where does it attach to the filter, how much space does it use up? I also heard a penguin was a good choice, but they didn't have it where I shop so I went with the aquaclear mini but thought this might be good to add on.
Heidi