I recently got a 125 for free....it came with 3 emperor 400's and 3 milenium 3000's......now the emperors i've heard of never used them before but i got them up and running quite quickly......a question about them.....should the bio wheel constantly be turning or should it kinda stop and go.....i've adjusted the spray bars on the inside so they constantly turn because i figured the less time out of water the better but i've only use aquaclears so these filters are new to me.......also the millenium 3000's are these any good i'd never heard of these before.....but how can i say no to free......thoughts and reviews would be nice