Once you find the deep spot where they spend most of the day, when you get there and they are gone, try some shallower water closer to shore. They often move out of the deeper water to feed, usually in a school.
As you probaly know, Crappies look up to find their forage, thus, be patient when presenting your bait to them. Don't simply drop your presentation to the bottom, reel up and jig. Instead, starting jigging as soon as your bait enters the water and drop it real SLOWWWWWWW. I have caught Crappies right below the bottom of my hole. Jig the entire water column. When you get bites, try to notice at what depth as that may be a pattern for future fish. I like to use horizontal jigs and plastics for Crappies and at times, if they are finicky, I will tip the presentation with one or two spikes or a waxworm. I like to use pink and white colors for Crappies. My favorite plastic is Little Atom Micro Nuggies. If using a horizontal jig, make sure the plastic is attached so it is also horizontal.
I hope this information helps you. Crappies, at times, can be feast or famine....but never give up! One of my favorites to fish for. Good luck.
Best of luck!
Fox Lake is a great lake for crappies. Read back through the posts for locations,depths, baits, etc. The ice is unsafe in areas on Fox right now, so be careful! Get information from the local bait shops!
Read through the posts on any lake you want to fish. Get a Hotspots map. The maps show depth contours and even give info on where to fish for many types of fish! Do your homework before you fish and you will be successful!