You can use clear glass marbles, glass beads, Decorator or plain rock (wash it really good) (I use planter rock), just about anything to allow for drainage (see what your local nursery or garden supply center has and your preference), and you just need enough to cover the bottom. No, there is no indication of light burn for your situation.. Since you don't have drainage, the I would say that this was the beginning of your issues and the water has no where to go or get out. Doing this should alleviate the problems you are having now. Do this: get a new pot, fill with the rock or whatever you are going to use and just enough to cover the bottom, not heavy. Take your other pot, kinda smack lightly around the pot to loosen the dirt, turn upside down, take out the plant with the dirt and transplant entire pot into the other pot, that should do it, and I would not water it if it is really wet, it should just be moist enough to hold everything together. give it a day or so, check it, then water lightly, your problems should be gone... You can use cal-mag almost all the way throughout the entire grow. Hope this helps out...