I think it's not excessive to QT for at least 90 days after some of the tales I've heard... I read a post on FB from a guy who quarantined a female WTF for less than 30 days before adding her to his collection, and he wound up losing ALL the WTFs he'd had for 7 years due to the female being the host of some unknown parasites! Also another really good reason to test a frog before adding it to an established collection.