No carbon. No skimmer. No smell. Smell has never been a problem for me. I might add a bit of carbon a couple times a year. Could it be over feeding or really high bioload??
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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