Hey there Autogrowz , you do have symptoms of magnesium deficiency as you can see from the yellowing happening on the serrated edges of the leafs , rust color spots are calcium related symptoms. It's not a big one though, and it could also just be that the leaf is old and died which does happen and is totally natural. The big problem is the not flowering thing. Try triggering flowering by feeding flowering nutrients as well as unsulfured mollasses, sometimes changing the nutrient profile of the soil kickstarts the flowering process. Hope this helps ! 🚀