You really should QT so you lessen the chance of getting your main tank infected.
I put in a little sand, and a few rubble pieces, I still need to pick up a couple of plastic plants.
I mostly did the rubble since I have so much of it, orginally I was going to throw in a couple of fake plastic rocks (I still may swap out the rubble for fake rocks).
A bare tank may be less work I like it better with a little something in it since it is right next to me in my home office.
My
LFS owner takes very good care of her tanks so getting a sick fish should be rare for me, in those cases I'll have to do a little extra work.
Have Fun.