hey dude, must have good seeds, the tomato fert is going to be high in k (i dont even know what it stands for) but the k in npk

and for the moment you want the n to be higher, the tomato stuff is something like 4.4.8 you want it to be 8.4.4 i think, if your in homebase i think baby-bio works good, but i aint sure about it either.

Also with cannabis plants i dont give it anything for at least 4 weeks, as it is very likely that you will burn em, when you do start giving ferts go easy as well, if it says half a cap-full per litre add half a cap-full per 4 litres at first then inrease it to th reccomended dosage.

Also the spot in your picture seems very dark, i do hope that you have a better spot ready or that your spot gets more light at other times of the day.
((try to stick to the no less then 6 hours of daylight rule- and alwasy keep in mind tht more light= mroe bud ))

I am also very new to growing, and will stay tuned to your log wish you luck!!