Gelato 45

As Mr.Weeds says. Plants will cannibalize leaves that aren't taking in enough light.

I think you have a few things going on there first I want to start by saying ur doing a good job it’s looking good just need a lil help I think u have a mag cal Deficiency along with pH problems I would also say you have phosphorus deficiency Solution flush your medium very well with pH water get a Cal mag supplement along with a good bloom nutrient give it a week or two see how you’re looking easy on the nutrients