Yea, jumbo cardinals from aquabid. They are wild and the vendor said he treated for external parasites.
I have a 20L sitting around as well as rubbermaid rectangular bins and have used them all for QT at some point and like the brute can the best just because I have found some fish like enclosed round walls after shipping so they can see and not hit the sides plus get a nice circular flow, the top down view has never been a real issue, but I can use the 20L if it's that much better.