What should I do if I do need to replace one of the filter pads in my filter? The filter I have has two filter pads, and one of them is torn. I remember reading that you really shouldn't replace them, so do I need to replace it? And if I do, how do I do it and prevent my tank from re-cycling, as it just finished cycling a couple of days ago. Since it has two pads in there, will I be ok replacing one? And is there anything I need to do before adding the new pad, (if in fact I do need to replace it) Thanks