Yet another topic that will likely see some disagreement is whether or not, fluorocarbon line sinks.
Glen just did another video with Hank Parker about fishing jerk baits. I quote Hank: " People think fluorocarbon line sinks. I've heard that said so many times. Fluorocarbon line does not sink, it's neutrally buoyant. It doesn't sink or float." Hank gets his information about different lines, their compositions, characteristics, etc. from the good folks at Trilene, so he isn't just stating his opinion.
I hear it on forums, videos, and TV shows all the time about how you can get an extra foot or so from your cranks by using fluorocarbon when that extra depth should be attributed to the smaller line diameter. That same extra bit of depth could be achieved just as easily using mono of the same diameter.
I proved this to both myself and a regular guest on my boat. My cranking reel is spooled with 12lb. fluoro and I have an extra spool filled with 10lb. mono. Both have the same diameter.
I pulled up on a bar that ran for 50yrds or so and is 7ft. deep. I had him cast a crank to a marker and retrieve it, making a mental not of how often and where the crank made contact with the bottom. We switched to the other spool and he repeated the cast with the same results. The only difference, in his opinion, was a much more detectable feed-back when using the fluorocarbon. Using the fluoro didn't get the crank down faster, or give it extra running depth.
As much as I dislike fluoro, I use it for two reasons, (I don't deal with abrasion issues) visibility and extra sensitivity, not because it sinks.