I have the penguin 330 biowheel HOB on my 55g and I was curious as to the importance of the ''bio-wheels'' I took them off last night since i put clean filters in it and it got so loud, and the tank seemed to do fine, much much quieter without the wheels and it didnt get dirty or anything. How important are they, does anyone else run it without the wheel like a topfin or aquaclear HOB? thanks