Newb Question on Peat Pellets and Rock wool cubes!!

I currently have 3 seedling in peat pellets that I started germinating on paper towel 11 days ago. The plants look nice and healthy but they have an extreme stretching problem I currently have them standing up straight on paperclips and I have a 6500 k Blue light about 4" above them.

1. My first question is how long does it take for plants to stop stretching?

2. I plan on setting them up on a aeroponic pvc system so whats the best grow medium to transplant them to? can I keep them in the peat pellets I have grodan Rock wool grow blocks but idk if that's all i need.

3. I also have 3 other seedlings in rockwool cubes that I began germinating 3 days ago I want to know how often should I water them and should I keep it at a 5.5 to 6.0 ph level?

4. when should i apply nutrients to the rock wool seedling when i start watering? I already mist the peat pellets with the proper amount of B1 THRIVE ALIVE
 
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