N-P-K stands for the 3 Macro nutrients plants need which are (N) Nitrogen, (P) Phosphate, and (K) Potassium which flourish comprehensive doesn't supply the needed amounts of these 3 macro nutrients.
Actinic has absolutely no benefit with aquatic plants, it doesn't do anything for them. As far as the 10000k bulb, technically you can use it for plants, but 6700k bulbs are closer to the kelvin temperature of sunlight, and are a lot better for aquatic plant life.
As for the API root tabs, API products in my opinion are just eh.... I would go with either some type of DIY root tabs using Osmocote plus, Flourish root tabs, or going with RootMedic root tabs. The reason is API is well know for just using iron, and potassium in their products, and nothing else. Whereas the other tabs I mentioned above contain a wide variety of nutrients which will benefit the plants a lot better.
You can always order these things off the internet using a debit or credit card, if you don't have one you can always go get a pre-paid debit card so you can order from the internet.
15g Fluval Flex - Will be a planted shrimp tank