I've been in the nursery business for years and I always feel sorry for people who try to over-winter tropicals. They usually are so close to death by Spring that it takes all Summer for them to even start to look good again. But if I can grow plants in a dorm room closet, I'm sure I can help you. lol Yellow leaves is a watering problem. Too much or too little. Just stick your finger in the soil. You'll know which it is. Remember, moist, not mud. Next I would strongly suggest a grow light on a timer. The days are just too short to provide enough light during the winter. Don't waste your money on expensive grow lights. A cheap Home Depot light on a clamp will do fine. If you're feeling especially enthusiastic, you can get a metal halide light. (like a street light) Very powerful, good spectrum. You can pick up a small cheap one (about $30) at Home Depot in the lighting dept. among the outdoor and garage lights. With that you can grow tomatoes in your basement if you want. Set your timer to be on for 12-14 hours. You'll be amazed at how fast the leaves will regain that rich healthy green and start to grow again.Good luck. (not that you'll need it after following these instructions.)