deeunit1answered grow question 4 years ago I don't thinkk its thrips,thrips aren't too much to worry about though,a bit of cinnamon water and they're gone.They don't do much damage unitil your infested.It looks more like a deficiency,I'd say Nitrogen.Is your PH OK.Make sure your water "ph" and feed are all correct.See if it wipes off with a wet finger.