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.
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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