The air temps are generally pretty comfortable this time of year, but I still like to fish from a shelter to block the wind. It doesn't matter how warm the air temps are, the wind blowing across the snow and ice can get cold. I like to put my shelter in a position where it blocks the wind, but isn't pulled all the way over. The Frabill Glide-Trax shelters pull from hole to hole easily, and serve as a great wind block and fishing position.
Pay close attention to your sonar and do what it tells you to do. One thing that was very apparent on a late ice-fishing trip last season was that the fish, especially the crappies, wanted the bait above them. The MarCum LX-5 sonar that I was using does an outstanding job of showing fish right on the bottom. With some units it's hard to differentiate be-tween bottom-hugging fish and the actual bottom, but the LX-5 leaves no doubt in your mind.
The crappies would come in very tight to the bottom. We would put a bait right in their face, but they wouldn't bite. After this happened several times, we started holding the bait above them, trying to tease them into biting. It worked!
They were willing to move a foot or two up to take a bait, but they didn't want it right in their face. If the fish won't eat what you're showing them, or how you're showing it to them, show them something else in a different way. That's why I particularly like the Berkley Atomic Teaser. It keeps the fish biting in a wide range of situations.
One last idea. Sometimes some fish are more susceptible to being caught than others are. For instance, the perch might want to bite but the crappies don't. Don't get too hung up on catching a particular specie of fish. It's more fun to catch a bunch of perch than to not catch any crappies.
The next few weeks of ice-fishing season are a great time to be out. Yes, it might be a little slushy, but it will probably be pleasant weather, and the chance for getting bit is very good. Even if you prefer open water fishing, this is a fishing opportunity you don't want to miss.