Ficus elastica Ruby is a variegated version of the Ficus Burgundy. The Rubber plant will tolerate lower light but definitely not Ruby. iT will enjoy direct morning sun then bright indirect light for the rest of day. Evenly moist is the way to go for this plant. Let them drip dry before returning to their saucer, or if you water in situ, tip out any excess after 30 minutes. No wet feet! A good water every two weeks is about right but decide based on the soil. Let soil dry out down to about 1 to 2 inches.
Dust leaves. Toxic.