yellow edges and folded down leaves / manchas amarillas y hojas dobladas hacia abajo

Thank you both (@experimentgreen and @The8thChevron) for your help. I was checking the pH and it was a bit below the value (5.4) so I adjusted it to 6. There are new spots on other leaves and I think it might be a potassium deficiency. I'm using feeding hybrids fertilizers (EC at 1.4/1.5). I'll wait a few days to see how it responds and if it improves.

Hello friend, So without us having all the specifics in a diary we can only give some guesses and you'll have to decide if any of it applies. In the close ups you can see the tips of the leaves are a bit burnt, this is often a nutrient burn, an excess somewhere, especially with the tips curling up and dying...sometimes light stress can cause this too but it will typically affect all the edges too not just the tips. Then you have the fingers that are curling under, this is often a nitrogen toxicity...which will usually also cause the tip burn. Is there any chance there's any overwatering/ under watering happening? If your ph is accurate and in the right zone for your medium, either 6-7 or 5.5-6.5 for a hydro setup then you could rule that out as a possible problem. Then I would focus mainly on the possible nutrient problem. I hope everyone can help you out some. Happy growing. ✌️

My first guess here is pH problems. Off levels of pH will block certain groups of nutrients from being absorbed. Your plant may also be suffering from overwatering or heat stress. As the grower, you will know by your habits which of these is probably most likely. If you have a fan blowing directly on them, that could also be the issue. Final thought: plants will drop 1-2 hours before lights off. If you're on a 24/0 schedule, you may see your plant dropping for 8 or more hours a day and be confused. In this case, don't worry, it's a natural circadian rhythm. You're not in bad shape, your girl looks happy and mostly healthy, keep up the good works!

english translation: My plant has some spots on the tips and / or edges of the leaves, there are also others (in the lower-middle part of the plant) that have folded down. It is my first grow, I leave specific photos and one of the general state of the plant, I hope you can help me. sorry for my english, i using translator