I have 2 Bio Wheel Mini's, 1 125 Bio wheel and 1 170 Bio Wheel and i have had almost no problems with the wheel not spinning, one thing is to make sure the filter cartrage is clean and that there is no buildup at the end of the wheel.
Originally posted by pinballqueen
thanx Anton. (sorry, didn't mean to hijack). Do they sell a big tank filter without the biowheels (say, 55 gallon size)? The mechanism itself is great, I just don't like the biowheel part of a HOB...