hey there Rawsome, the yellowing of the leafs at the bottom is a nitrogen-related symptom, when the plant has too much nitrogen it can "lock out" meaning it stops absorbing it through the roots and starts cannabalising itself. You can tell it's nitrogren excess from the "too dark green" and "shiny" aspect of the leafs as well as the burnt tips. right now you're giving three additives, two of which contain N. You should be giving one NPK, one cal mag and one additive. Try to cut out all the additives except zym. Enzymes will help break down the excess N. The bad news is that lock out is quite a hard thing to fix, so the problem will get worse for 5 days to a week before it gets better. Keep a cool head , follow the plan, maybe try a flush if you like. Hope this helps ! 🚀