Calatheas are part of the 'prayer plant' family, Marantaceae. The 'prayer plant' nickname stems from the daily movements of the plants leaves, known as nyctinasty. Various plants in this family move their leaves up at nighttime, and lower them in the daytime in accordance to a circadian rhythm. They move their leaves by changing the water pressure in their pulvini, the swollen nodes at the base of the leaf, along the leaf stalk (petiole). It is believed that these movements are meant to follow the sun’s movement in the sky in order to maximize light absorption.
Thrives in medium to bright indirect light, but can tolerate low indirect light.
Water every 1-2 weeks, allowing soil to dry out half way down between waterings. Expect to water more often in brighter light and less often in lower light.
Does better in higher humidity if possible. Consider incorporating a fine-mist mister or humidifier to boost humidity level indoors.