I think you are asking several different questions here.
I'm not clear on what you mean by...
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the Whisper is doing a horrible job with filtration especially with the oxygen side.
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The other question about putting the old filters in the new filter plays to a common misconception that the beneficial bacteria colonies exist only in the filter. Actually they are everywhere in the tank and changing your filter should make no difference,however, a slight spike in ammonia and nitrate is possible. If you are worried, you only need to cut a medium size piece and put it in the new filter.
Jay