For snow and sand riding, running your fat bike tires at absurdly low pressures — we opt for around 5 psi — will give you maximum traction and control. But running such low pressure can make a tube inside your bike tire vulnerable if you hit a rock or sharp root as you’re cruising along.
For technical riding, we like to set our tires up with sealant inside instead of a tube. Ask your bike shop if your tires are tubeless-compatible. To convert tires, you’ll need a fat bike-specific rim strip, valve, and sealant for each wheel, as well as a tubeless-compatible tire.