Sorry to hear about the losses Brad.
Actually if it is really velvet, chloroquinine phosphate would not be fast enough in treating it. Even cupramine is too slow for most cases, I would actually use the pure copper salt copper sulfatate in QT. I know how you said copper is bad for the fish in long term but what if there isn't a "long term" for them anymore - it's either you cure them or they are gone.
CP is good for using in the QT when new fish arrives, I've seen places that treat it on all new shipments; the speed it can get to the fish is questionable though.
Formalin is basically a burning agent, whatever it can burn in the water or on the fish, it kills. Formalin alone does not cure MV in most cases and it takes off fish's slime coat. It should not be used if fish has open wounds either or it kills them.
MV is one of the reasons why people QT their fish
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Red Sea, Black Saddleback, Brown Camel, Orange Fin, Melanistic Clarkii, Common Clarkii, True Percula, True Picassco, Pink Skunk, Orange Skunk, Maldives Clown, TRUE Sebae clown, Akin Clown, Gold Striped Maroon, White Striped Maroon, Latezonatus
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