YES!!!!! It's absolutely worth the time and effort. I have a 75 gal
display tank any just use a 10 gal
tank for a QT. I only set up the QT when I'm getting something new or I start to see signs of a problem. The QT doesn't have to be anything fancy. All I have is a heater, small powerhead (optional), a hang on filter, and some PVC
for hiding spots. No live rock & bare glass bottom. It works great and it saved me a lot of stress. I started using one after I brought home a sick fish then had a mass die off soon after.