Hate to say this but looks like you did everything wrong. The supersoils are missing a key ingredient which is the bacteria necessary to break the large fert molecules down to a level that the plants can absorb. The yellowing of the lower leaves is due to an inability to uptake nitrogen from the soil. I don't know why the upper leaves turned purple. It could be the plants genetics to do that, or could a nutrient problem. Never use supersoils without bacteria. They really should be mixed in with outdoor dirt which already has bacteria. For indoor grows you want to use a potting soil at your local grow shop like Foxfarm brand, Roots brand. Here's a video of someone using foxfarm's ocean forest soil mixed with happy frog soil. If you just use happy frog potting soil, you won't need to fertilize at all until late in the grow. Then add a little supplement for bloom/flowering, but not too much. Ask person at store for help if you need to. Unfortunately, it might be too late for your little plant. I'd transplant into a bigger pot and see if it survives. Keep posting on what happens. http://www.youtube.com/watch?v=kT9pCxjI7dc