While rubber plants are a pretty hardy varietal, they do have a few specific care requirements in order to find the right balance in their environment. That means providing lots of light, moist (but not soggy) soil, and enough fertilizer to keep it healthy.
Like most plants in their genus, rubber plants love lots of bright, diffused light. They can tolerate soft morning sunlight but should be moved out of the line of harsh direct rays in the afternoon as they can singe the leaves. Plants that do not receive sufficient light will become leggy, lose their lower leaves, and their leaf color will become dull instead of glossy and vibrant.
When it comes to their soil composition, rubber plants aren't picky. Typically, any good, fast-draining potting soil will likely do—many indoor gardeners opt for a cactus mix. In addition, rubber plants prefer an acidic soil mixture. Like fiddle leaf fig trees (which many believe they resemble), they also "eat" their soil and will eventually have their roots exposed. When this happens, simply top your pot with additional soil and it will not be an issue.
Water your rubber plant frequently—they like to be kept steadily moist but not soaked. Rubber plants also are vulnerable to excessive dryness and don't tolerate drought well. To check if its time for another watering, check the moisture levels in the first few inches of soil—if they're dry and crumbly, it's time to water your plant again.