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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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A brand new bio-wheel is supposed to spin freely, and rather fast. As it becomes waterlogged and cultured with bacteria, it will slow down, eventually to the point of stopping for a few seconds in between partial rotations. This is perfectly normal, and desirable - as long as it isnt stopping long enough for the top portion to dry out.

If the filter is brand new and the wheel doesnt spin then there's a problem. I would double check that you have it installed correctly.
 

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Make sure the track is clean (snails, moss, riccia are the most common things I find), and the filter is pumping water very well. If the filter slows down the water trickles under the biowheel without making it turn.
 

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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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Twisting the paper makes the distance from end to end a tiny bit less. If the wheel was binding at each end, so not running well, this will help, until the paper relaxes. Also makes the diameter of the paper part a tiny bit smaller. Not sure how this helps.
 
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