Put a piece of carpet or cardboard over your tip up hole when ice fishing. Even filling up the hole with snow will block light entering the hole. Cotton clothing retains water and loses its heating abilities when wet, even from sweat, so don't wear cotton next to your skin. Wool and some manmade fabrics stay warm even when wet. Change your fishing line often.
Old line means missed fish.
Those little clips on your reels will work as a depth finder. Fishing walleyes on tip ups in a lake with pike so you are not using a leader, ease the fish to the hole. This keeps the fish from running and cutting the line with its teeth. Put a ground cloth under your tent. This can be a tarp, an old shower curtain, or anything to protect the bottom of you tent from unwanted water.