HI all, well for christmas i got a 90gallon tank (yay) and had a few questions. I have an emperor 400 duel bio wheel filter coming in the mail. i also have a bio ball filter already here. Now the questions. would it be better to run either the bio wheel or the bio balls or both? I would like to know this so i can keep the tanks nitrate and ammonia and other harmful stuff to a minimum. so does can anyone give me some info as to which would be more helpful.