[Crusty Old Shellback]

Not saying to go this route.

I've had SW tanks since the mid '70's. Reef tanks since '90, and a 400G Natural Salt Water tank for over 10 years.

I've never QT'd anything.

I've had ups and downs.

In my 400G tank, I've had Ich show up on a new fish, but it disappeared in a few days. No other fish were affected. I've kept a Moorish Idol alive in that tank for over 4 years, Pair of Naso tangs over 7 years. They wound up dying because my skimmer and pumps failed and the tank basically ran out of oxygen.

I'm a firm believer from 10 + years experience of using NSW that there are things in that water that can not be duplicated. I've seen things happen in my NSW tank that I've never seen happen in other tanks. I believe that was one of the reasons I had success with my 400G tank with no QT. But I do not have any scientific data to prove it, only years of observations.