Brown spots on some leaves

High bro, Your EC went up because you plants are drinking more water than nutes. Lower your EC and adjust until they keep the same reading. When you give the right amount the value will stay stable. The beauty of a DWC system is that you can refresh your water and nutritions really easy! I would refresh the whole system with pH 5.7 and EC low (for the stage that your plants are I would say around EC 1.5). Then continue growing like you did before. They look beautiful! Happy Growing! 😋

somewhere I read that an excess of an element can be similar to a deficiency .. type cal mag K

I see a small excess of nutrients ... a few days with less ppm .. max 700

Das ist tatsächlich eine Mangelerscheinung, bedingt durch die zu hohe Temperatur der Nährstofflösung. Besorg Dir einen Wasserkühler für Aquarien oder sorg dafür das Deine Pumpen kalte Luft verteilen. Die erhöhte Temperatur fördert auch das Wachstum von unerwünschten Pilzen und Bakterien, also handel lieber früher als zu spät. Viel Glück!

I get bits like that u wouldn't worry plants looking good happy growing

Do you change your water once a week since it has been budding? Also, check your roots and make sure they are still fine and dandy. After that, test your pH and nutrient levels, as well as checking your media, which may need flushed. One of those things is probably the culprit. Or, depending on how far along your buds are, it could just be fade. I hope this helped. Good luck!

I don't know to much on DWC but it looks as if they are getting over fed and beginning to burn a bit. If the EC is going up could try adding in more water to your res if it is falling in water level and see if it helps. I bet they are drinking more currently. Good Luck! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***