Would depend how hard the crust is on the top of the silt, if the water is clearish and you see the spot try dropping a lead on it and seeing how far it plugs in which be my major concern about using a fluro rig in this situation, if the lead plugs into the silt on cast then you are going to be left with a section of the hooklink sticking straight out where the lead has plugged in, personally i would probably use a supernova braided hooklink in this situtation
Bait wise a slow sinker/wafter or a snowman should just sit nicely on top of the silt