formulex is a food and this is more a vegging tonic, to promote new growth once rooted. Neither of the two product you mention are required before or during the rooting process for your cuts.
Use this after they have rooted and are vegging, and it is mixed and ready for use right out the bottle.
whats this friggin guy on at the grow shop then! why work in a shop you have not a clue about what they are selling!!!! FFS! taking it back now! thanks mate