ok so this is my first plant. It was given to me and the person that had it was putting some nasty fertilizing shit in the plant that was attracting flys and nats. I brought the plant inside b/c of all the bugs around it. it got so bad that I had to transplant it in to a new pot w/ new dirt. I dug the plant out and got out as much of the old dirt as possible to get rid of all the bugs. I put new dirt in the new pot (scotts potting soil) and followed the instructions on the back of the bag for transplanting. It has now been a week or so and the bottom leaves are slowly turning yellow and falling off. what can I do to preserve my plant. it is about 1 1/2 ft tall.