Do not be wary of trying another cardinal. I would suggest If you do then make use of the QT first. It will be much easier to treat any problems and observe the fish in a basically bare QT. Also, you will not put your other fish in the DT at risk. Good luck just my 2 cents.
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Tony
Current Tank Info: 180gal DT, BM NAC77 skimmer,3 Maxspect razors, Maxspect Gyre 150, 30g QT
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