2nd Grow Questions (pics)

Hi im new to growing this is my second grow my first try didn't go to good, healthy plants till the devil dogs got to them (ferrets). Just have a few questions been reading up alot and couldnt find info. Had problems with leafs turning yellow and cracking but it wasn't receiving nutrients at that time could it be light was to close. Using 3 cfls with 2 fans blowing at the plants at all times. Im a newb is that right, im doing it for the stems to get stronger. Should i be aiming one out? Its in a closet with about one inch cracks on all sides and top enough airflow? Windows open basically all the time and about half the day the closet is open? Mistake? Also i once heard about spraying perrier for c02 on the leaves instead of doing that with water which ive been doing. Also on probation for arround 6 months so can't smoke wondering if theres a better way to get more yield or higher potency if not in a rush. They've been on 24/0 since begining but recently switched to 20/4 prob going to do 18/6 but scared of stressing. Thanks alot for reading as you can tell im a newb any help would be great. Can't wait to smoke them hopefully there females. Sorry for crappy pics will get better ones if i get responses. Theres 2 diff plants at 3 weeks, one is retarted finally catching up at one time it wasn't growing on one side lol.

Most important thing is the question about whats the best thing to do to get more yield and potency in 6 months. Please help :rastasmoke:

:( comments

If you want a bigger yield do scrog or take some clones if you get a female and grow as many as you want or you can just let the plants grow taller and possibly get more yield that way, potentcy, get some good seeds thats all I know!

PEACE