Just curious what these spots could be, runtz auto flower, 21 days above ground, 2 gallon grow bag, fox farms ocean mist + 50% pearlite, 75-80 degrees, 50-70% humidity, water twice a week, tap water which has set out 48 hours, philzon 600 watt led, actual power 130 watts, 18 inches from plant, 24 hours a day, any reply greatly appreciated, thanks again
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I wouldn’t worry about a few blemishes on older leaves.
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Thanks, I wasn’t sure as this is only my 2nd grow, have a good one
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Do you know the pH of your tap water, or the EC/TDS? Leaving it to sit is good for letting chlorine dissipate, but it’s still important to know what’s going in.
Your plant looks good, it’s possible those spots could be the very beginning of a deficiency, but if it is, more chance it’s because of pH rather than a lack of calcium.
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It probably is a deficiency, but look carefull under that big sun leaf close to the soil. See how it looks a tad like scarring. I would make sure there are no bugs under that leaf hiding near the petiole. It also looks similar to early spider mite damage. Not for sure; but I would check it out closer.
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Looking good Growmie!! Agree with @MidwestGuy and only seeing some spotting on one leaf?? Could be some lensing burn from top feeding drips?? 
would check as @noddykitty1 mentioned as well
Not sure of the ph, I was trying to get through this 2nd grow before I got into ph ing the water, I have ordered a tester, I did see 2 small white insects on a leave a few days ago, so it could be that, I appreciate your feedback, I will see what I need to get to get rid of them, thanks again
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Never heard of fox farm ocean mist? Is that a new soil?
My bad, it’s not mist but ocean Forrest soil