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I found your thread! Thanks. A couple of observations from a guy that lives and grows in the heat. It was 109°F in my backyard yesterday. Reservoir change weekly is paramount because plants will use some nutrients more than others in the heat. The only way to know that your nutrients are in balance is to start fresh. Learn about Liebig's Law of the Minimums to understand why this is so important. Sativa dominant plants like the heat better. Others have covered humidity get it up as high as you can in veg and early bloom. Plants that look like yours are susceptible to bud rot late in bloom. Make sure to have lots of air circulating in late flower to prevent bud rot. A late defoliation will help but be careful not to thin too much too soon. Did you order some Botanicare HydroGuard? Who is the breeder for these strains and are they photo or auto? They seem short for the strain so you may want to set the light about 24" above the canopy to help stretch a little.