Place your Ruby in a location where it can receive bright, indirect light. Too much direct sun will scorch the leaves, but this plant will not fare well in low light spaces. Placement a few feet removed from southern or western exposure is ideal, or directly in an eastern facing window works too!
Water when the top part of soil has dried out. Water evenly so that the soil is damp, not soggy. When watering, water the plant with fresh, lukewarm water generously and evenly from above, then tip out any excess water.