The plant is totally healthy! When temperature drops around 50-60 degrees F, cannabis leaves will naturally turn purple... it's something about the chlorophyll. The purple surely adds to the appearance too!
I would suggest moving the lights up a bit farther from the plants. Young seedlings are very sensitive to too much light. They also look very saurated. Let the soil dry out a bit before you water again. I hope she pulls through!
Your plants are looking great Killer. I think raising the lights was a good idea... or atleast I would have done the same thing. How far above them are they now?
And yes, that sativa may look short and stunted, but once those lights change she will explode.
I totally agree with hybrid. It is so much better to see when the plants are hungry than when they are burnt cause they ate too much! You are gunna love having her to smoke tho!
Your plants are looking really good! Nice-n-healthy if you ask me. I'll be interested to see how this strain grows! As for the small mark on the plant, I wouldn't worry. :hump: