Should I QT fish that I’m getting from another reefer?

[BaileysTank]

So a local guy is taking his tank down and I’m taking 10 chromis off him that look pretty big and he’s had for years he also has a yellow tang blue tang acheliesc tang ect. What I’m wondering is that is it worth it to QT the fish becuase my QT tank is only a 20gal

 

[Harpo]

I would QT. Not worth the risk