HELP! PROBLEM IN MY GROW

No diary, limited information and minimal pictures = very hard to answer. Are you sure they have not been sprayed with something, to me it looks like poison/herbicide.

Creo que es un exceso de temperatura, puedes mirar este articulo https://www.cannabislandia.com/blog/cultivo-interior-de-marihuana-en-verano/ Saludos😃

Hi there It will be a lot easier to help if you make a weekly updated diary that way we can see exactly what you’ve been doing, Saying that she could over/under watered possibly to much neuts as tips look burnt, or heat stress etc.. Try and eliminate one thing at a time, Give them a good flush and start back on half dose of feed, raise the light and see if there’s any improvement, if not move on to next factors, Best of luck 🌱

In order for us to suggest what you might do, we need to know what you've done... so please start a diary - put in as much information as possible and then ask your question again. The diary doesn't have to go back to Day 1, but if you can at least reconstruct the past 2 or 3 weeks, that would help us greatly. Help us help you!