RUST SPOTS ALL OVER, ANY IDEAS?

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Hey fellas, on my first grow here. Purple widow auto at 51 days old now. She has all these little brown dots on the older fan leaves all over. Im not overly concerned about it yet but Im just trying to find out what deficiency or the problem is here and could it really hurt her at this point, since im running her for two more weeks maybe 3?

Her grow medium is 30% kind soil 70% FFOF, no nutes added except ff big bloom on two occasions on waterings about two weeks back. Temp stays 70-80f and rh at 45-65% and lights running 150w led at 15" above canopy. Tap water ph'd down to 6.2-6.5 everytime
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Hey fellas, on my first grow here. Purple widow auto at 51 days old now. She has all these little brown dots on the older fan leaves all over. Im not overly concerned about it yet but Im just trying to find out what deficiency or the problem is here and could it really hurt her at this point, since im running her for two more weeks maybe 3?

Her grow medium is 30% kind soil 70% FFOF, no nutes added except ff big bloom on two occasions on waterings about two weeks back. Temp stays 70-80f and rh at 45-65% and lights running 150w led at 15" above canopy. Tap water ph'd down to 6.2-6.5 everytimeView attachment 888306 View attachment 888307
View attachment 888308

Looks like a cal/mag deficiency


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