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Make sure the fertilizer has some form of other secondary macros and [micro nutrients]. Ca, S, Mg, [Fe,B,Zn] exct.
Cannabis is a heavy feeder and loves extra calcium and magnesium
Good Luck!
20-20-20 is a good start, give them a small dose at first and as they get bigger give them a bit more until they're getting a full 1 and half tablespoons...