What next? How do they look?

Hey all. My first grow ever. I've got 6-7 plants that germinated. I started off wrong and this is what I have done so far.
Left the seeds in paper towel for like 5 days instead of two. Tap roots were really long. Put them in RW in aeroponic system. They are in a closet in a garage. Temps were around 100 degrees for the first two weeks of in the aeroponic system. Seems that the growth was really slow. I nute burned them once. Temps are now at 80 - 82 since I changed to CFL's and T5 light and growth has exploded instead of MH. They are (i think) 3.5 weeks old (only counting time in the aeroponic system).

PPM is at around 450-550. pH is at 5.8
They are getting 20 hours light, 4 hours darkness.
They are sprouting the 7th set of alternating leaves. Max fan leave count in 9 on a single off-shoot. I am also having fan leaf branches growing off of older branches.
The roots are approx 7 inches long.

My question is about how old are these plants? Why are some taller than others?
What PPM nutes should i be using? What light schedule should i be using at this point? How close should the lights be?
Can I tell if male or female yet at this point?
[attachment=o257265]

I can see the nute burns on the lower picture from when you fed them while too young. They look healthy now. Your temperature is on the "too warm" side, as the ideal temp is 75F. To me, they look like they were put in the net pot about 2-3 weeks ago.
Although they were clones, none of them will be like identical twins. The reason they are not the same size could be from any number of things from coming from different mothers to one being closer to the light etc etc. You will not be able to determine sex until they have been in flowering (lights at 12/12) for about 10 days. CFL's and T5s should be about 3 inches from the plant a MH should be farther away, depending on its size. At this stage, you will have the option of letting them grow a bit more and take some cuttings from them, then as soon as they are well rooted, flower them to see what sex they are. Make sure you tag each one so you know which clone was taken from what plant so you can destroy any males.

good luck!
keylime

Thanks! I appreciate your input!

and basically every question asked could be answered in the Basic Grow area or the FAQ area.

edit: if you started the seeds yourself and dont know how old they are you might want to stop now because it gets more in depth from here.

:beatdeadhorse::postreadfaq::joint1: