What’s going on here?

There are a few reasons why a marijuana plant might start losing leaves, and the remaining ones turn yellow. One common cause is a nutrient deficiency. Like any plant, marijuana needs a balance of nutrients to thrive. If it's not getting enough nitrogen, for example, the leaves can start to yellow and fall off. Overwatering or underwatering can also lead to similar problems, as it disrupts the plant's ability to absorb nutrients properly. Another possibility is a pest or disease issue. Spider mites, for instance, can suck the nutrients out of leaves, causing them to yellow and drop. Root rot, a fungal disease, can also affect the plant's ability to take up water and nutrients, leading to leaf loss and discoloration. Environmental factors like temperature and humidity can also play a role. If the plant is too hot or too cold, or if the air is too dry, it can cause stress and lead to leaf problems. Finally, it's worth considering the plant's life cycle. As marijuana plants mature and flower, they naturally shed some of their lower leaves. This is part of the normal aging process and not necessarily a cause for concern. However, if the leaf loss is excessive or accompanied by other symptoms, it's important to investigate further to determine the underlying cause and take appropriate action.

I’d guess your soil ph is off check the ph from the run off water it’s prob acidic and needs a few gallons of plain tap water to wash it out Also kinda looks like you poured water with nutrients on the leaves