Hey thanks for the responce I am pretty sure I have isolated the problem. I believe the plants were in too small of pots as you can see they are in these little ones and I just put them all into 1 gallon pots the roots were all over the place so now I beleive they have room to grow now hopefully this will help them. If the leafs stay yellow or get worst then people are saying it might be a nitrogen def issue.

oh yea and to answer your question they are exactly 3 weeks old grown hydroponicly and they are clones.

This is my first time around so hopefully everything goes well.