Hi reefbuilder, as much as all of us wanted a QT, but some of us using IOS tank may not have that option due to space constraints and also keeping temperature low for QT may also be an issue. If the QT is small, the stress build up for the fish may have killed it instead of quarantining it. I certainly agree QT is an option we love to have, I was a victim of not quarantining my fishes in the past. Sent from my iPhone using Tapatalk