CANNA's Rhizotonic, Is mainly used for root development and exfoliating dead roots to make way for fresh new ones, and SUPER-THRIVE, is an ultra strong potion, that is as well as aimed at steady root production, is also used for rapid growth healthy green leaves and bigger fruit (bud) production.. you only need to literally use a few drops to avoid nuit burn... hence the reason I only have a small vial of it, (my res. is always between 5 and 10L), so depending on the size of your hydroponic res. bare this in mind and upscale the amount of drop's you add depending on the amount of L in your res. eg/ 3 drops per 5-10L, 6 drops per 15-20L 9 drops per 25-30L etc etc... I dont grow in soil so the method and amount you'd add you'd have to question a soil grower, but to answer your question, they do do different things - STELTHY