My tank stinks

did a fish die? how much nitrates do you have? overfeeding??? a lot more info is needed to diagnose this..
 
phenols in the water cause the stink.

increased aeration will rid the tank of it. You might be overfeeding or not have enough filtration.
 
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Whisper Power Filter 5 ? If my memory serves me well that's not enough filtration for a 55 gal, if I am wrong correct me please.

For now I would change my water 50 % and change your biobags...
 
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