I’m at day 42 here. Im having some problems that have developed over the last few days. My light was moved from 10" to 16", my EC is 1.2, and my temps are 79-80 during lights on. Any ideas? I would really appreciate any feedback.
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Raise the lights a bit maybe 10 to 15 inches for a couple of days, I believe cannabis perderse low intensity light in flowering stage and lower temp with a low hum, and if it gets worse It’s most likely your nutrients, cut down 1\3 of your feeding
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But it does look a lot like nutrient burn especially on the sugar leaves
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@Noti
This is Hydro? 
How often do you change over to fresh nutrients?
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That’s pretty low Growmie, bump that up to 1.8/2.0. What’s the PH…5.8-6.0 for hydro or drip systems. These 2 could be the issue but need a little more info, what’s the res temps 
do you have a light meter or a phone app for checking your lighting intensity? I use DLI and for the stage of flowering would be around 40-44ish
I change out every two weeks. This will be day 14 since the last change.
I have my PH currently at 6.3 and the reservoir temp are 72f. I have a lux meter that is reading 48,000-58,000 throughout the top of canopy. I currently have the light at 16" which is per manufacturer. I will lower the res PH right now.
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The res temps are high and above 70 is risking root rot. Are you adding a root innoculant to the nutrient solution check your roots, they should be a healthy white unless your nutrients solution comes out dark
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