it has been a long dead subject for me but i heard her tell another customer that, so it opened the door again. anyways to answer some of your thoughts. i did everything u guys suggested except for the melafix. cool idea BTW. it never seems to work. i gave it a bit of a spin and it stopped dead in its tracks. i got a new canister filter a year ago and its still working great. a bit of a story for everyone....i was at work the other day and i found another tank, took out all of the marineland filters i had and set them up. the wheels didnt even bother to spin. the water level is good because its backing up due to the wheel not spinning. anyways long story short, i am planning to run the filter without the wheel and use a bio-max or my favorite, matrix. ill see how this works. i just wonder when the manager was thinking when she said "it only spins when it needs too". thanks to those who have posted and thanks in advance for those who will or may post.