I see all kinds of videos on YouTube that you have to put a Fluorocarbon leader on braid.

 

The new Berkley X9 comes in a crystal color. Would that not be invisible to the fish?

 

Your thoughts.

The few times I've seen "crystal" braid, it was just white. Fluorocarbon being "invisible" isn't due to it being clear, or nylon monofilament would be invisible too. It's about the way it refracts light under the water.

57 minutes ago, Tywithay said:

The few times I've seen "crystal" braid, it was just white. Fluorocarbon being "invisible" isn't due to it being clear, or nylon monofilament would be invisible too. It's about the way it refracts light under the water.

Exactly.  Crystal color braid is white, not clear.  As many members of the forum here can attest, I don't know how much of a difference a leader makes.  I started fishing straight braid Berkley Fireline Crystal, and caught plenty of fish.  With that being said, I am also now 100 percent braid to leader, except for heavy duty applications like frogging and heavy flippin' and pitchin' or punching.  

 

There are a few reasons that I now utilize leaders, in no particular order:

1) Using a leader preserves my mainline, and keeps my spool full

2) It allows me to provide some measure of protection to my rods, by using a leader with them that is in line lbs wise with manufacturer rod specs

3) I can adjust the lb weight of my leader for specific applications and techniques

4) It is not overly burdensome to tie connection knots now that I have become proficient

 

The bottom line is do what your comfortable with.