The length of leader seems to vary, while I am fishing it in the ocean such as Westport, I use a standard mooching length. I partly do this because sometimes I actually stop and mooch, all I have to do is replace the Fish Flash with a sinker. If I am using a fish flash in an area like Johns River, I shorten it up to about 30 or so inches. I do this also when fishing the Chehalis river.
Really, just don't be afraid to experiment and what works for you will do!
BTW, that is the set-up that I used last year to land that 60 pounder out at Westport, so yes they do work.

Steve
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C/R > A good thing > fish all day,into the night! Steve Ng

Dad, think that if I practice hard, they'll let me participate in the SRC ?
[Gig Harbor Puget Sound Anglers....Join your local chapter. CCA member