Dry fly leaders?

[TylerKunz]

So for most of my fishing career I have always been told to use a lighter mono leader and tippet when fishing dries, mainly 6x or 7x. Although watching ksl outdoors however, on the fish tech report mickey showed us how the mono can just sit on the water and look totally visible, and now that i think about it mine looks like that a lot and I'm guessing that's why I'm not picking many up on top. So he said use fleuro tippets and leaders because the fish cant see it. But doesn't fluero sink? will it pull your fly under water? I'm curious what everyone's thoughts are here...
[signature]