Yes, everything should be QTed, although HOW you QT can change with each fish.
Some people QT and do a hyposalinity treatment, others treat with medication. It comes down to what you are QTing. Normally I QT all tangs/angels/etc. however there are some tangs that don't do hyposalinity well, powder blue & brown. As well some fish are such picky eaters that a traditional QT might not be for them, e.g. Copperband Butterflies.
A 10g tank is fine, its what I use for my nano. Just be aware that sometimes a 10g is too small for 6-8 weeks.
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