Before going on a week long vacation, I changed the soil from a dense potting mix to a chunky mix consisting of charcoal, perlight, coco husk, and all purpose potting soil. I came back to the leaves Yellowing like this. Is the Yellowing from transplant shock or under/ over watering. I also moved it alot further from my grow light because I noticed the ends starting to burn. Any help would be extremely helpful. I got this plant for $30 because Walmart had it labeled wrong. Should I cut around the brown spots, remove the leafs entirely or let them be?

