Please take a look at these pics and let me know what you think. All 3 of the older plants were planted at the same time and have received the same water and nutes. The plant on the right in the front is bent over a little with some LST.
1 of 3 is sick
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Looks like they could use a little cal/mag.
YUP.
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This looks like one of the most common problems with autos. Calcium Magnesim defecnicy, get a cal mag supplement and add .5 ML per Litre of water. That is my opinion due to the crinkly leaves and rust colored spotting on the leaves, it is not that bad so it should be an easy fix.. Even though all the plants have had the same conditions some phenotypes of the same strain can require subtle differences in conditions for optimum growth. Also make sure your PH is right so the plant can absorb the nutrients(I am sure you already know that I always just try and make sure) Hope this helps, happy growing and I am sending super good grow and good health karma your way!
Thanks everyone. First, for all my friends in the US, we will be suffering tonight in south Florida. It is going to dip down in the 60's tonight.
I have been adding cal/mag each time I water, even when I don't add my fox farm nutes. I have just been scared to up the amount because my other two are growing. They all have been a little short the whole grow but from day 21 to 27 they have doubled in size except for the one with the spots. I have ph my water each time I water to 6.0 because my soil ph is about 7.5. I will make sure it is right before I plant on the next grow. For the first time today I watered with 2 teaspoons of molasses. Hopefully, that will help. karma, karma, karma, my friends.
I have been adding cal/mag each time I water, even when I don't add my fox farm nutes. I have just been scared to up the amount because my other two are growing. They all have been a little short the whole grow but from day 21 to 27 they have doubled in size except for the one with the spots. I have ph my water each time I water to 6.0 because my soil ph is about 7.5. I will make sure it is right before I plant on the next grow. For the first time today I watered with 2 teaspoons of molasses. Hopefully, that will help. karma, karma, karma, my friends.
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Lower your PH to around 6.5. That is the optimum for Cal and Mag in soil. Here is a chart that has helped me quite a bit, that I got from Steely. It just shows what different nutes are available to the plant at different PH levels. It Think that you will see a difference if you lower the pH. Hope this helps 
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