advice and opinion for my plants

well about about 6 weeks into the whole process i started with 2 weeks of 20/4 to get the plants going then switch over to 18/6. i water each plant every day with 2 oz of fresh water at room temp. i give it fert. mircale grow 5/10/5 twice a week (because i dont want to over do it)
i have a fan running at all times to keep the air moving
so far they look like their doin ok but one of them isnt getting taller but is growing leaves and such is this ok?
also they are starting to smell very strong,
im guessing this is a good sign any idea on how much longer should i wait to flower them and when i can get an idea of what sex it is

any comments or concerns please let me know
thank guys

No way those are 6 weeks something is definately wrong.Thats about 2-3 weeks of size in the pics max.Maybe bigger pots roots must be bound to be so stunted.Shouldnt be any smell at this point as nothing has been produced to smell yet maybe little imagination running wild.When your decide to flower remember the plants will probably double or triple in size so keep that in mind for grow area.Are you using an mh or hps light system maybe get it closer

so i should change my pots to bigger ones any suggestion on the size? and the actually sizes of the plants one is 1 foot and the other 2 are 6 inches

Also the ferts your using are for flowering.You should be using something with a higher N right now like 6-4-4 which I am using Fox farm.1 time a week with the ferts is best.