flowering question

some questions if anyone is out there. how long until sex shows after 12-12. i have heard up to 14 days. also i didnt switch the water yet. it is still grow formula at 400ppm which is low but i was afraid of burning these fuckers up. will it hurt if i stay with the grow formula?

no, do stay with the grow formula into the 3rd week when they have finished their stretch. by end of week one into week 2 slowly add bloom nutes to your mix and gradually go higher on the bloom while lowering veg- u will save urself alot of heartache by doing this. as for sex, some strains a few days, some a few weeks but on average I would say 10 days should be right on

thanks ....