I usually keep two packs of the ceramic rings (that freshwater people use for biological filtrations) in the sump. Whenever I need to QT any fish I just take one pack out and put it in the HOB filter to get an instantly cycled QT.
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375g Envision FOWLR + 125g sump
40g Reef
Current Tank Info: 375g FOWLR, 40g Reef
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