Hi
@Inganjawetrust! Something is wrong with your medium, you probably have some salts buildup impacting the pH. There's only one solution to solve this: flush your medium. Give it a good flush with ~50% of the container's capacity, only plain pH'd water (5.8 is fine). Help the medium to dry with a small fan blowing a continuous breeze on the container, and see how it goes after a few days. What nutrients have you been giving, at what frequency, what was the EC? Please give us more info about the past feedings so we can help you adjusting those parameters. Hope this will help, keep us up-to-date and happy growing 👊