DT + QT + TT ???

[straightrazorguy]

It depends on what kind of fish you have and how you plan on treating them, should the need arise. If you get a horrendous Ick or velvet infestation, you may decide to treat all fish outside of the DT and leave it fallow for a while. In that case, can you fit all your fish in one tank? Will they fight in those cramped TT conditions? Will you have fish in anothher QT?

I have 2 33 gal tanks for QT/TT, but I've only ever used one for both QT and TT (I religiously QT and treat all fish preventively). As a result, I've never had any major outbreak in my DT. The other 33 gal is now running with some dead rock I am converting into live rock.

It's a typical case of YMMV...