White spots on leaves

Herb potman

Well-Known Member
Hey all found 2 white spots on 2 out of 4 of my plants. Autos 22 days old now. Only giving water ph at 6.5 due to there planted in final pot of ffof and was told no nutes till week 3-5. Pretty much when I see bottom leaves turning light green then feed at 1/4 amount of feed chart Any suggestions on what whites spots could be.
 
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