first grow, 4 plants, 400w MH, first real few questions @ 7weeks

hi guys, I've been doing a grow for close to 2 months now and havnt really had a whole lot of questions thus far. I have 4 plants growing under a 400w MH set up. inside of a 2x4x5.3 ft tent. I'm using fox farm grow big & also just purchased fox farms tiger bloom. I have a few questions that I would appreciate if anyone or few people could help me out with. my plants are about 7 weeks old, there about 2ft tall, my first question is when I start to flower can I turn the light cycle straight to 12/12? or do I need to ease it in 30 minutes a day as if the season was changing? also do I start to use the fox farm tiger bloom when I do 12/12 or do I start using it before? on the bottle it says to use it with the fox farms grow big formula, but im assuming it means use this tiger bloom for flower growth after using grow big for vegetative growth. my tallest plant from what I can tell is female, she has white hairs coming from some of here colas and such, the other 3 plants are starting to preflower as well but I'm not able to make out there sex at this time. thank you guys so much for all your help!!!!! I will post pictures some time today after my camera chargers.

use both in flower. no just one

how do I do that? do I just split the amount up between the 2 amounts, so if it says 4tsp, use 2 tsp of each nute instead of just 4 tsp of the one?

i used there foxfarm chart, last time on, what to use, but also read your plants health, as they don't go by charts. As i have learn

ok, my plants look GREAT from what I can tell and think, ill be posting a pic here in a few. this is my first grow with plants, I've been growing mush for awhile now so I kind some what of a nack for growing things but am still new to plants. as far as the light cycle can I switch it to 12/12 or do I need to ease in to it?

you can do ether one, but i go strait 12/12 in flower my self. as it cost me everyday to run lights and ac. strait 12/12 is best i think?

this is my set up. the reallu up close pic is of my female showing her lil white hair. these where from seed and nothing fancy just a seed from a local bag of reggie.

thanks 209 cali for the information, you've helpd me out loads today.

I looked at the chart, so when I want to feed, I use each nute separate correct? if I remember hearing correctly if you mix the nutes in 1 jug it will form a nute that the plant can not use, thus true?

I just fill water in a jug halfway adding nutes one by one shaking in between nutes. This works fine for me. I think the idea is you shouldn't let the raw form of the nutrient touch so when they dilute in the jug they are fine.

mix together. when i get my first grow thread on hear, i used just grow and big, use the fox farm chart, some what. And had a really nice harvest. also, gave water, every other feed.

aright cool,I'm going to peep out the chart a bit and figure out how much I should do cause bottle said only feed nutes every other watering, and now my plants need a water just about every other day, since the 2 that hit 2ft tall they've been drinking up MUCH more water. so im thinking about going on ahead and bumping up the nutes a bit and see if the results stay good. I'm also going to start to 12/12 tonight, hopefully in a month or 2 ill have a decent lil harvest from these hopefully 4 girls. =)