Coming end of April 2020.
General Calathea Care Tips:
Light: Bright indirect sunlight.
Water: Keep soil evenly moist. These plants prefers moist but not soggy soil.
Humidity: These plants love humidity and many issues with them can stem from a lack of humidity. These plants are susceptible to spider mites, and crisping leaves especially when lacking enough humidity. You can increase your humidity with a humidifier, misting the plant, keeping it in your bathroom (so long as there is enough light), or by placing it on a pebble tray.