Not sure exactly what nutrients come with your system, but yea, if you want to get the most out of your grow, bloom nutrients will help you get there! It then depends on whether you are doing organic or not. If you are growing organic, I would recommend the Canna bloom boost. It is pretty expensive, but it is the best you can get. Just make sure you cut back on your regular nutrients if you bring in a bloom nutrient, as the ppm will increase. Typically as you get closer to harvest, you will start using more bloom nutrient and less of your regular fertilizer