You are right. That is what came with my first hydro setup. Dynagro has a couple of add ins too but I didn't buy them. It's easy, gro for veg and bloom for flower. they did real good in my system. I still have them but I'm trying GH 3part this time. If you know what you're doing you can mix them when you change to flower but I kept it simple. You run out of bloom first cause 30 days of veg and 60 days of bloom. You answered your own question but I hope this helps. They are good for beginners the only thing extra I needed was cal-mag plus. This time it's GH 3 part, cal-mag, B-52, Bud blood and Big bud.