Yes, Miracle Grow 15-30-15 is no where near what cannabis needs. Next time buy proper cannabis nutrients, GHE make Flora Nova Grow and Flora Nova Bloom that are really good and also easy to use as they are complete and require only one bottle of each with no mixing with other bottles of supplements. They are also rather concentrated, so one bottle will last multiple grows. 24 hours of light is also not good, 18/6 is far more plant friendly, as believe it or not, but plants actually do need to "sleep" and undertake certain metabolic processes that it can not do during the lights on cycle. At this stage there is not much that can be done to rescue this plant and seeing as she is rather close to harvest, I would be giving her only plain water and giving her some "time out" by reducing the light cycle to 18/6. This may just save her THC quality. If you think about it, 24 hours of light is basically plant "torture". No plant on Earth has ever grown with continuous light, 24 hours a day for weeks/months/years on end. Cannabis can only grow so much in any 24 hour period and for cannabis, this period is 18 hours. After 18 hours you are basically wasting electricity due to the fact that cannabis can only grow so much and remember, they also need to sleep so they can "repair" themselves. Constant light deprives the plant of this "repair" time and is no doubt a contributing factor to why your plant now looks like it does, combined with the inappropriate nutrient you have been using. During flowering cannabis needs something like 2-4-6 and nowhere near the 15-30-15 of Miracle Grow. Things to keep in mind for your next grow! Hope this helps,..... Organoman.