Leaves with yellow/brown spots are curling, drying and dying

Hi all,
I have two plants, I am using two 27w cfls, fox farms ocean forest soil, and just began giving them fox farms grow big nutes. They are 3 and 4 weeks old.

I am new to growing and do not know what is wrong with my plants. The problem started at the bottom and is working its way up to the top. First the leaves would kind of curl and twist then they would develop brownish splotches, which would next turn yellowish and then dry up and die. The growth towards the top of the plant still appears healthy.

Here are the pics, best quality I could get with my cell camera.

Are you giving them full strength nutrients? Are you feeding every watering day? Is the nutrient solution splashing on the leaves? All of these things could be causing the burning on your lower leaves. If I were you I would discontinue feeding, and stick with plain water to see if the root zone bounces back, as of right now I don't think that your plant is over fed (no signs of nitrogen abundance), but it seems to have an acidic root-zone which is killing of it's foliage as a response to it. Cut off the burnt parts, as your plants aren't using them anyway, dead leaf material invites pests and stresses your branches with dead weight. Fox farms ocean forest is a great soil but you really shouldn't need to use added nutrients unless you are using stronger lighting, and they have been known to have overly acidic soil for some breeds. You should also consider taking pictures from further away and consider giving the forum the size of your pot that you are using. All of these things will help determine whether it is: over-fed, overly acidic root zone, over/under watered, or simply a plant that has root bound it's pot. Remember that I do not know everything! You should solicit a few more responses before taking any drastic steps. Love your plants and they will bounce right back, I'm sure of it.
Sincerely,
ILove

I am using nutrients at 1/4 strength, I water when the soil is just about dry and this problem occurred before I introduced nutrients. I moved them from a solo cup to a pot about 5x5x6, when I moved them to the pot they seemed to recover a little. By "root bound" do you mean that the root system was to big for the solo cup? because when I moved them to their larger pot I could definitely see that the roots were cramped, maybe this was the problem?
Thanks