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Hi, was reading this thread and after looking at the pics, I can tell you whats wrong. First is overwatering. The plant is under flouros and does not have the explosive growth that a HID does. I have found that I water way less under less intense lights. Second is the potassium def that is causing the purpling in the seedling. As the medium is overwatered, nutrient lockout is happening also. Look at threads in the infirmary and you will recognize your seedling's problem's.
Third is underwatering. You are letting the medium dry out to much. Look at those pics the coco is light brown , dried out looking. The key is to keep coco moist at all times, never dry, yet dont water log the roots.
And if I was you , I would ditch the Botanicare Cal mag and get some Magical from technaflora. Trust me, hands down the best cal mag I have ever used.
I also have some questions for you. At what ph are you watering your plant with? How often do you feed your plant? How often do you water?
Now a question about your nute's. What is your formula? meaning what is being used and at what strength.
We can help you get on track here if you answer my questions ok? Good luck .
Thanks for consideration. Theses days, I water when ever the medium is dry'ed. normally, 2~3days on 24/7 light cycle. My ph is 5.8. and I am not using Cal-mag. I mix RO and tap water 50/50 which makes 120ppm. and I put Micro to make 300. and then i use Bloom to make 550~600 ppm. every-time i water, I water til the run-off point. This is my first grow, and i realized that I shouldn't use just RO water. I took this advice for some user here and it seems working on my another seedlings too. and yes, i think i was under-watering and over-watering. I let the coco dry out too much like you said. and, I realized that even in the seedling stage, the root needs the nuts. this grow was stunted because i didn't use any nuts on seedling stage i was using stright RO water which has less ppm like 50 lolz. in this way the root didn't grow so plant didn't grow. and I used Cal-mag that time and i realize never use calmag before plant shows the sign too. and then the plant got burn from the light and nuts lock-out. this plant is still small man I wonder this is worth waiting!!