Tops going brown ?

its the genetics... many of these modern strains aren't performing well in DWC. I learned to grow in DWC from mostly your profile, and no doubt man it is the genetics vs. DWC. Thanks for being a good teacher! 💪

Hello mate, to me its cal mag def, these type of leds make the plant need more cal mag, you are using very little for your week. I use the mars hydro and i put 2.5 ml per lt of Advanced Nutrients Calmag, while the max is 2.00 ml per lt. Increase your cal mag and everything will be fine. I grow only autos check my diaries.

lower the ec and adjust to 5.8 they look overfed and cant handling it very well imo. from millions of autos i’ve seen here and there they are not heavy feeders usually.

It looks like a copper deficiency, why it could be that I don't know. Your a good grower so it could just be a genetic thing. Don't pick this answer even if I'm correct as I'm not competing in the competition.

I'd lower your EC if its not needed and raise the PH up to 6.2-6.3. Good Luck!

Autoflowers are a weird breed... I happen to think that what's happening with your grow is that one plant is finishing before the others... it's happening to me with my Glueberries... One plant finished while the other two are probably 2-3 weeks away from harvest. There was absolutely NO QUESTION in my mind about that plant as the trichomes were almost 60% amber so it came down. I had treated each plant the same - so it's simply a matter of genetics. Check out your trichs with a scope or a loupe to see what's going on... The discoloration of the leaves, at this point in an autoflower grow, generally indicates the end of it's life.... Good luck and happy harvesting!

Looks like nitrogen toxicity from feeding too much, or too often,,, or both. Probably too late in flowering to do anything about it now that will cure it, but ease up on the feeding. Every plant/strain has its own needs and wants, and feeding every plant the same thing, at the same time, is not ideal. With experience you will develop the skill to identify which plant needs feeding and with what and how much/how often. A bit like people, some like a 3 course meal, some are happy with a bowl of soup and other are going back for seconds (and thirds!).

Some strains or sometime just some phenotypes are more capricious and sensitive to feeding than all the others. you can eventually identify then adjust individually your nutrients soup for that one plant, but personally when all others plant are fine i just don't bother and let it be as from my experiecne it never went dramatically worse especially when your advanced enough into flowering and not far from harvest.