fixed float at about 4 or 5 foot down would be what we would try ....adjust the float accordingly .....
tiny tiny feather jigs in a 1/64 number 8 hook or VERY small plastics on the same weight jig head
orange and or reddish tints maybe ? and tip with a crappie nibble .....
that would be the artificial presentation i would put down .....
but to really whack them a red wiggler on that same jig head should make them wish they wasnt there is my bet