Agreed bother @NUG61. When you find something you like and works for you, its hard to change!!
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Is that the only leaf? If so normal operation. If it’s multiple leaves up the bloom and cal mag
I looks like other leaves are affected. If it is the ph being off, adding more bloom, which will add more K , could cause the micro nutes to not bond with the K and will.not be transpoted through the plant. Not saying your thought is wrong but i would try the ph balance before i increased the nutes…imho 
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1st picture tries to give an overview of the plant in front with the issues
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Other pictures show more of the 2 plants in Fox Farm soil which seems to be going well.
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Ok now i see you are a bit further along in flower than i first thought. I still think its a ph adjustment. How many weeks in flower?
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4-5 I’d say
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Of an 8-10 week flower?
Just watered plant with issues till runoff…ppm is around 1600
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Wedding cake autos
Thats too high for my liking but others in soil may say not to high. Even in soil i wouldn’t go over 1500
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Just watered with 6.5 ph until runoff then tested ppm
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All 3 started at the same time…plant with the issues now looks about 4 weeks behind the other 2 on flowering
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@NUG61 …The miracle grow soil pot is very light 24 hours after watering until runoff…Fox farm soil is still fairly heavy 48-72 hours after doing the same
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Run your finger inside the egde of the pot as deep as you can and see if its wet. Water if you think its dry.
Looks like what happens when you underfeed bloom imo. That 1600 ppm may be all nitrogen pebbles for all we know. Flush it real good with sledgehammer and re feed with the right bloom concoction next feed is what I would do.
Check the PH of the runoff. Mine was high and locked outthe nute intake. The plant will show deficiencies of nutes.
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