That plant is hungry for more food. If that were my plant I'd probably go to store and get some chemical fert like Peter's or Schultz and follow the directions on the container. The bottom leaves being yellow and the rest kind of look pale green, and both appearance indicate the plant needs more food. Other than that, it looks ok. Ideally, you get a liquid fert that has alot of micro nutes in it, so if you can afford a little more cash, go to a hydroponic/grow store and get some Dynagrow 7-9-5, which has alot of micronutes and use about one half teaspoon in a gallon of water and give it that. Then wait to see what happens.