I use the sterile, soiless seed starting mix, no fan and have never had problems. I also start my seeds in my 70 degree sunroom so I think that the warmer temperature helps. Some start their seeds in a cooler area like a basement. Fungus loves cool and damp. It's ideal for them to grow.
I also set my bag of soiless mix and also my potting soil outside for about 2 days when the temperatures are below freezing. This kills any fungus gnat eggs and possibly other things too. I have had no fungus gnats since I started doing this before starting my seeds.
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