@Grecanna420 , separate bio bloom,it is the most needed out of all.a base NPK nutrient.Think it like a soup.Water is biobloom,needs to be added first.TopMax and BigBud are basically same.some PK boosters.Can be used from 3rd week of flowering(supposing it is a hybrid) until the end with no problem.Bloombastic is most likely some combination of bio elements,possibly including sugar and enzymes,you can use them whenever you want in flowering.I don't see a necessity to limit their usage as they are all designed for flowering stage.Also that's what I do.You can use all of them together with minimal doses yeah.But simply, it is a overkill.You'll most likely see some problems.No need for big bud if you have top max already or the other way around.Bloombastic sounds to be the most powerful one of these but basically they are all designed to boost PK in flowering.