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bio wheel

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A Marineland 100 external filter came with my tank. It has a "bio wheel". It looks like a water wheel, made of corrogated paper product. It looks as if it is supposed to spin. However it does not, though it will spin freely if I pour some water on at. Is that normal?
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Some models with the biowheel such as the Emperor series by Marineland, have little plastic clips if you will ,that the shaft on each end of the biowheel spins on/rides on.
These over time, can collect crud that affects the ability of the biowheel to spin freely.
Can slide these up and out and give em a cleaning, and it can help also.
 
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