Burned and curved leaves

Sorry, forgot to mention, It was 3000 to 600 PPM, thank you for the tips brother

3000 to 600 god dam thats a big jump. Glad to be of some help for yea. My ec pen works on the 500ppm range. so 500ppm = 1ec, but some pens use 650 or 720 ppm to 1EC, the end goal should be to always work in EC as 1EC=1EC no mater what. When you say 3000, im guessing you are talking PPM or using a different measurement that would be 3.0EC? Don't forget to calibrate your pen as well. I found mine was off by .2EC out of box. If you get a good amount of runoff every time you water you won't need to measure runoff unless it looks like something bad is happening. If at all possible try and get it some more light. or support its floppiness with garden spikes or it may snap when entering flower from the extra weight. One tip I found to be helpful for feeding, add in all the nutrients you want feed with a smaller volume of water then dilute it down to the desired EC. If it makes way to much volume after the fact then you need to cut your doses down by 1/2, 1/3 or even 1/4. PH adjust once you hit your EC target. Good Luck!

Thank you M0use, its indeed lacks light, It only gets direct sunlight from 14h to 18h00, im using an EC pen, the run off started as 3000 and its 600 now, thank mate

Looks like it could use more light the inter node spacing is large. When plants are not getting enough light they also do not feed as much, stretch and become prone to snapping branches. I'd look into getting a EC pen to help confirm your strength of your feeds, but you most likely corrected the problem. Damage already done will not improve but should stop progressing. Confirm your feed is a complete nutrient line up with all the macros and micros as your medium is void of nutrients. Ca, Mg, S, are the secondary macros that get skipped a lot, I'm sure it has lots of N,P,K the main trio of macros but the micros are sometimes missed. Good Luck!