ive been trying this new GTR nanodax stuff and its beautiful to tie to braid or nearly all fishing knots, its so supple yet pretty strong stuff but it does mark the line easy with abrasions but wont snap that easy. the squid dont seem to see it, nor the trout or jewfish.
ive used the pink egi sunline fluro leader, and works fine on squid, but the trout can see it. (only the pink one, switched to same brand in clear and trout dont see it. dont ask me y?? had a arguement with the guy at the tackle store he claims all flurocarbon leader cant be seen by fish. i know what i saw for 8hrs straight. fish comes up see the leader swims away. repeat 8hrs! changed to clear what do u know caught it!) ive used the pink on other fish salmon,flathead, jewfish dont really have a issue.
also the the berkley vanish is very good bang for buck, its cheap n nasty but works very well. $25 from big w / bcf for 250yrds bargin i say!