LIFT method float fishing for tench is one of the most effective ways of catching the species. Learn great rigs every week in Angler's Mail magazine.
To set up a lift method float rig properly make sure you plumb the depth accurately and then slide the float up the line (from a few inches to over a foot).
You then need to place some bulk shot the same distance from the hook.
Just make sure the line is tight when fishing this method.
Bites are registered by the float lifting out of the water as a tench takes the bait.