Savez-vous quel est le problème ?

Thank you very much for your responses. To be more precise, I’m growing in all mix soil. I water my 14L pots every 3 days with 1L of water at pH 6.5, until there’s runoff. Currently, my plants are getting yellower and the tips of the leaves are turning brown and curling up. The stems are red. I don’t know my EC. I usually dilute 4ml of alga bloom for 1L of water. But I’ve done two waterings with pH 6.5 water because I was afraid I had given too many nutrients; unfortunately, it’s getting worse. I’m thinking of adding alga bloom at my next watering, but I’m not sure if that’s a good idea? I’m going to buy Calmag; that seems like a good idea, thanks for the advice. Thank you very much for all your tips!

Hey there I think this could be the start of a deficiency, either N P K. I would recommend buying CalMag from Biobizz to prevent any issues with your plant. Otherwise, try watering with just water twice before resuming nutrients. But from my experience, every time I've had deficiencies, I've been able to resolve everything regularly with Biobizz's CalMag, which is an excellent product. Hang in there, my friend!

It could be the temps too but as Mr_Incognito said it's hard to tell with just a picture. The plant looks good tho

Assuming you’re using soil and mineral nutrients. Do you measure ppm (EC) of the solution? Most likely it’s a little nute burn, but it’s hard to tell by one pic and a small piece of information. Are you sure brown tips didn’t appear before the last feeding? If not, just be careful with heavy doses of nutrients. When you feed every other watering or every 3rd watering etc., you risk to get salt build up and nute burn when the soil dries up after applying nutrients, because in such case you have to compensate the lack of feeding during only watering phases. Then you give just water, the plant feels better, but the damage is given. Feeding less doses but more frequently is a bit more failsafe if you don’t exceed the limits of your plant. Just need more info from you. Is it soil? Do you water until runoff? What is ppm (EC) and pH of the solution/runoff. The difference can tell if you overfeed or underfeed the plant.