First led grow

So long as they have all the nutrition the plant needs you will be fine. I haven't used them particular nutes before but have looked at them. Check there feed chart to make sure you can finish the plant with just them 2 nutes.

Water. Organic. You don't need an "agent" you don't really even need to flush tbh. The only time I do a proper flush is if the plant is still very green towards harvest (which is like never). When you're happy with the buds and trichomes just finish her with water 🌱👍