Brown tips and purple stems

Perhaps a slightly higher dose of fertilizer. Try only clean water for the next watering. Monitor whether it will spread further.

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Hola. Lo que veo en tus fotos puede ser un principio de sobre alimentacion. Mide el ph y el ec de tu drenaje de maseta. Que no tenga una ec alta y que el ph no este fuera de los rangos. Suerte.

Hey pal. So if your purple if its on your main stem And or showing on signs of your leafs that's just a light zp issue. Most of us tend to get them when light is exposed to our open stems. As I said. If it was any issues. You'd see some purple on your leafs and so on. Look for where hardly any light gets. And the stem. If your stem main stem is purple you have a mag issues. Cut 1 of those bloom boosters. Pick the 2 most beneficial. And make sure the N is low is 1 and doesn't exceed what a later stage plant needs. U lightly have tip burn. Tends more to show from overfeeding when it gets later into the flower or into the pre flower stage. As I said. Pull back on so much bloom boosters. You'd your EC must be too high. And feed once a week for soil. Coco everyday and even that must be followed up with water. Good luck

Something that has very slowly built up, if you have been consistent with how you have fed... if that's the case, it'll only take a minor tweak to fertilization. I'd wager this is a very tiny over-feed more likely than an underfeed.. various things can cause burnt tips - toxicities and deficiencies. So, you always have to eliminate the least likely options. Plants look great, which is the most important thing. A little burn is okay. It shows you are pushing upper limits of what it can use relative to growth rate (which comes down to a multitude of environmental factors, which is why one garden is always a bit different than the next as far as needs) e.g. S def or tox can cause tips to bun. P-tox can do it. I'd probably wager slightly too much P, but i'd just drop your feed 5% and call it a day. Because you are so surprised by it, i'm assuming it took a long time to show up, and is therefore progressing slowly, which equates to being only very slightly off with the feed... In fact, if you continued to do what you are doing it'd probably turn out fine too... So, dial back 5% and see what happens over next 2-3 weeks...

Looks like you just pushing the line a bit to much for nutrients, it's just enough to burn the tips so I'm guessing cut it back to the lowest 850 ppm and leave it there for a bit and see how that plays out, they're looking good other wise...Great work😉

Burnt tips is from a slight nutrient burn. Purple stems could be in the genetics. You can also get purple stems from intense lighting,temps fluctuations and stress. 9 inches away seems close for the light. Try dimming or raising it up if they are stressed.