You can use diluted regular houseplant fertilizer once a month or during the growing season of spring through early fall. Too much plant food causes excess salt build up in the soil that can result in leaf burn.
The leaves tend to face towards the ray of light, so it is a good idea to rotate the plant occasionally.
Make sure I am not being burned by harsh, direct sun.
Use distilled water rather than tap water to prevent the build-up of minerals.