Okay, I know this topic has been discussed at great length and I have read several threads about it but before I go get a new filter I want to ask for other possibilities... Biowheel stopped moving.. completely. Took whole filter off the tank, cleaned all tubes, impeller, impeller housing and walls with a fine toothbrush. Tried replacing the filter cartridge. Tried running it without the filter cartridge. Cant get the wheel to move. Wheel is not dry or damaged. It becomes almost completely submerged in the tank water which it wouldnt do if it was dry. Yes the wheel is seated in its grooves correctly and will spin freely with my help, but then it stops and doesnt re-start. Any options other than getting a new filter?