Well, you may have your lines crossed here, so to speak. Any of the the stink log types have the teeth to break a mono/fluoro leader of as much as 10 lbs, perhaps more, but the bass, perch and crappies can be caught on light leaders, 4-6 pound is probably a good choice for them. You need to match the leader to the target fish, the toothy guys will bust off without steel leaders or relatively heavy mono/fluoro leaders.