Hey pilgrem I be assumin yual be usein this here box yual made to be growin from start to finish? If so yual will be keepin in these same pots yu be showin they be in now? Ifin yu realy want to use some sort of bloom builder nute my suggestion be when yu are ready to flower them yur final waterin while in veg be flushin 5 times the amount at least through the pots of the pot size. ifin they be 1 litre pots flush 5 litres of fresh water through them until run off water be runnin clean. Then yu can switch to flower and the next time yual be waterin and yu want to add yur bloom nutes start out with half strengh of the recommended amount and watch what the plants do if they like it yual can slowly increase yur nutes but be patient and carefull pilgrem be listenin to what yur plants be tellin ya and yu do fine. Good Luck pilgrem hope yual yield what yu be needin.

I be usin MG products and be lovin them they never did me wrong here be some mine I use just fur refference.

BWD