What you are seeing is the leader laying in the surface tension. I would use a Fluo tippet. Movement will cause the leader to break the surface tension. For lake fishing you might find you need to add something to the last few inches of the tippet so it will break the surface tension. There is a commercial leader sink that you can use. You can also use a detergent liquid soap. I have use the soap and it worked OK. It will wash off and you need to reapply frequently.
Gehrkes Xink Leader Sink