What pound test line does everybody use on there worm harnesses,they will be for trout and walleye.
Most of the harnesses I tie for walleye are 15# to 17# fluorocarbon. Keep in mind that the Walleye caught in lake Erie can be 30" class fish. They can tear up 17# quick. If I'm fishing rivers, lakes where the Eye's are more like 20" max, I would feel comfortable cutting back to about 10#.