I feel just the opposite. I want my fish to always be healthy and immune from everything and for about 40 years they have been. I have not lost a fish to a communicable disease in about that long and never will. Some of my fish are 30 years old and still spawning. None of my fish were ever quarantined or medicated. I keep them immune.Now having a QT tank for fish is almost a no brained for me.
Not QTing everything wet is like riding a motorcycle. It’s not a matter of if, but when u go down. It’s gonna happen.
In 3 weeks my tank will be 50 years old. If it happens now I will still call it a success. Everybody here with a 50 year old quarantined tank where nothing has ever been sick and the fish only die of old age, raise your hand......Higher.