Hi, my penguin biowheel 350 filter (in a 37g tank) would stop if the power would go out so I put it on a battery backup which keeps it up during power outages. That helped but now even without loosing power, it stops, by itself. I have to tap the outside of it (around where the impeller is) and it usually starts back up. I'm thinking about going with the better quality emperer biowheel filters. Anyone have experience in emperers?