I actually do that on my side of the country  But most people do not appreciate it and rather pay $10 ocellaris clownfish than a $30 one; so they rather replace livestock and take chances.
It is same as asking how many people actually have a proper quarantine tank setup.
Unfortunately, most have to learn it the hard way to watch un-quarantined fish kill the pets that lived with them for 3, 5, 10 years before they appreciate such. And alot of them never learn either.
Unless you are really good with disease ID and medication, you are going to be lucky if you even break even. Throwing bi-furan and curpamine into a QT is not really quarantine
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Clownfish Collection: Normal Ocellaris, Black Ocellaris, Stubby Ocellaris, Tequillia Sunrise Ocellaris,
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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