What type of fishing are we talking here? Beachcasting or Lure Fishing??
For Beachcasting, a leader strength of 30 to 50Lb would be innappropiate unless fishing really light. Employing the accepted rule that you need a leader of the same Lb strength +10, as the oz of weight & bait you are casting, what you are suggesting would be too light.
For a 5oz lead say, you would need a leader of at least 60Lb. I use either 60 or 70Lb mono leaders, and use the same line for rig bodies.
For lure fishing, I have sometimes used Fluoro rubbing leaders, but 15 to 20Lb would be adequate.
I don't subscribe to this old wives tale that Fluoro is less visible, so you are going to catch more fish, especially when using it for Beachcasting where the Fluoro is nowhere near your end tackle & bait.