White mix

So I had two seeds of each strain to begin with. All seeds germinated except for one Papaya. But as they sprouted, several of them didn't seem to have the energy to grow. So, eventually I have been left with two Black Jacks and one Papaya. One of my Black Jacks is starting to look burned now, and I'm not sure why. My grow lights are pretty far from the plants because they're kind of powerful and my other seedlings seem to be doing ok with the lights.