My plants are at about the 4 and a half week mark right now and ive only fed them about 1/2 strength Fox Farm Grow Big once. They are vegging under a 400watt MH and have some very good soil from a college lab. and are watered about every 3-4 days but lately its been a lot sooner because I'm pretty sure the ones in the smaller pots are root bound. I am going to be transplanting tomorrow so I'm not too worried but I was wondering if this yellowing is from them being root bound or is it something else? I'm sorry my set up looks so ghetto right now I just sent for an air coolable hood, I have a 6" fan to instal for exhause, and will be putting up my ducting out that hole in the back you may see. I was wondering by the way if I vent into another room will I still be ok or is that a real no no? There is only 2 of the plants yellowing badly right now but a few others are a little pale. Any advice on this grow would really help me out. I purchased these seeds a long time ago and because of the graces of the company they sent me another package after the first was lost and said "Merry Christmas and Happy New Year". I found this to be rather calming and decided to start up the little buggers as soon as possible. Now I'm in this rut where I may be losing a good opertunity for some sticky stuff. Well Heres the pics the two on each sides are in the big pots and seem to be doing really well (I've also been feeding them a lot more of the Grow Big). I see some signs of sex but I'm not sure what they are yet (very very tiny). Oh by the way the strains are Bubblegum and Sweet Dreams 4 and 8 respectively. Thanks if you have read this far and I would really appreciate your help. Well looking at the pictures now I guess you don't see the Hole in the back wall but in some other posts I have it If you care to look for it.