I didn't see this mentioned but may have missed it....

I think it bears mentioning that it is entirely possible to use a mix of fluorocarbon and mono together; however, Fluorocarbon doesn't float very well so if you are planing on using small dry flies on a fluor. tippet, don't be too shocked if they want to sink.

I tend to use the fluor. when nymphing -- with the fluoro on the terminal end of the strike indicator on down to the first nymph and connecting multiple nymphs.