Get a sensitive rod and use a lite braid line....like Wakina once said....you can feel a perch fart with that setup! Look for a layer of fish marks on the bottom, it can be a solid line a foot thick when you are on a school. Keep your bait on the bottom, I like to let my weight hit bottom and raise it 6 inches then try to keep it still so I can feel the strike.....if they aren't biting I will let it hit the bottom and slowly raise it 6 inches until I feel a strike or if there appears to be any extra weight then set the hook!

You will have no trouble catching them if you take some advice from this group. Good luck!