i have a penguin 330 filter. it came with my tank, used. the wheel will stop spinning for ten minutes at a time or more. i no theyre supposed to move slowly, but is that slow normal? i have cloudy water due to my tap so i started doing 25% water changes with distilled and its clearing up but could it be partially due to my filter? tanks only been up for 2 or 3 weeks. just wonderin so i can fix the problem now and not a few fish later. thanx