puzzled

4 day old seedling autos, in a FF/perlite/black gold/leca clay/ dolomite soil mixture. 300watt led roughly 20" high from plants no nute just reg ph 6.0-6.3 water in 3gal air pot. Fan blowing on timer. I'll include pics but my first guess is spider mites or some kind of other pest. We have a few...