Any one seen this before?
Is this from nute burn?
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Wow never saw spots under that much magification before. I’m sure @OGIncognito or @MidwestGuy or @Myfriendis410 can help you right out bro.
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Need a full pic of the leaves to get a better understanding or idea or what could be the problem. But can start with age, light distance/ kind of lights, what kind of water your using, what soil you used, if you are using nutrients yet, what run off numbers are. All these things are helpful in finding the solution to your problem. I know this can seem overwhelming but take a deep breath you got this, this forum is super helpful and knowledgeable.
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Post pics of whole plant not magnified.
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Looks like calcium spots but as mentioned full plant pics. Soil and nute line helps a lot. Knowing the medium and ammendments helps determine if the nutrient line requires supplements. Some do. Ph numbers.
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Toxicity doesn’t resemble these spots. Post a full plant pic of the leaves affected Growmie. Could be water droplets from top feeding, under lighting these water droplets will burn the leaves 
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Good morninggang i agree with everyone need pictures of the whole plant kinda looks like mold but hard to tell without good pictures
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She is growing so fast, but she is sitting in happy frog soil. I just watered her till she started to flower. Then i started her on cronk’s clyde for bloom, with calmag by cronks. But the spots started before i started with cronks. I am currently useing ro water. 3000watt led lighting, around 1000 true watts. 6" inline fan with ac unit as an option. Temp range overnight 70º - daytime temp 80º. Seeds are from ilgm gdp af. Humidity has been aroud 50% but the last few days has been 35%.
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I’m leaning towards Magnesium deficiency. Have you tried adding any Cal/Mag or Epsom salts? I looked at the Cronks nutes but I don’t know anything about them…
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I saw some good things about cronks bonnie and clyde for autos, they say to add calmag for best results. Figured i try it out. I just started it, becuase my soil had what it needed for veg stage. I tend to start the nutes right at flowering.
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The spots on fan leaves are normal for flower or do I have the start of a deficiency? Should be around 3-4 weeks of flower time left on this girl. Just trying to bring her home fully and safely. Thanks in advance for the help… It’s not on all fan leaves just a few of them bigger ones
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That looks like lens burn from water or nutes being splashed on the plant. I wouldn’t worry about it unless it starts showing on newer growth
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I forgot I used a spray bottle to give them a mist 30min before turning lights on. Well glad it’s not a problem. All new growth veg an bloom are spot free so has to be the spray o was doing.
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If you have RH as low as 35% with temps 70-80 that could be a problem.
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What is RH? And how do I measure for it? My temp stays around 75-80.
No sir, I mean relative humidity. That stark a difference between temp and RH can upset the plants ability to breath and stunt its growth. If you can get your RH up in the grow room, that would alleviate that issue. Not saying that’s the end sum problem.
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Ok this might seem like a stupid question but, my photoperiod has the brown spot but my auto in same room in flower now doesn’t have any spots or anything, so my question is if rh an temp are off how do I set them in balance?
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Inline fan and/or humidifier/dehumidifier. Lights will add to heat and small fans will help cool air temp and with mold.
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@Dakisis: My compliments on your original photos. I understand why ones of the entire plant were requested, but I must say they’re among the best magnified ones I’ve seen on this forum. It’s not easy!
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